File Coverage

lib/Sisimai/SMTP/Status.pm

Criterion	Covered	Total	%
statement	37	39	94.8
branch	6	8	75.0
condition	13	15	86.6
subroutine	8	8	100.0
pod	3	3	100.0
total	67	73	91.7

package Sisimai::SMTP::Status;
use feature ':5.10';
use strict;
use warnings;

# http://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml
#
# ------------------------------------------------------------------------------
# [Class Sub-Codes]
# 2.X.Y Success
# 4.X.Y Persistent Transient Failure
# 5.X.Y Permanent Failure
#
# ------------------------------------------------------------------------------
# [Subject Sub-Codes]
#
# X.0.X --- Other or Undefined Status
#           There is no additional subject information available.
#
# X.1.X --- Addressing Status
#           The address status reports on the originator or destination address.
#           It may include address syntax or validity.
#           These errors can generally be corrected by the sender and retried.
#
# X.2.X --- Mailbox Status
#           Mailbox status indicates that something having to do with the mailbox
#           has caused this DSN. Mailbox issues are assumed to be under the general
#           control of the recipient.
#
# X.3.X --- Mail System Status
#           Mail system status indicates that something having to do with the
#           destination system has caused this DSN. System issues are assumed to
#           be under the general control of the destination system administrator.
#
# X.4.X --- Network and Routing Status
#           The networking or routing codes report status about the delivery
#           system itself. These system components include any necessary
#           infrastructure such as directory and routing services. Network issues
#           are assumed to be under the control of the destination or intermediate
#           system administrator.
#
# X.5.X --- Mail Delivery Protocol Status
#           The mail delivery protocol status codes report failures involving
#           the message delivery protocol. These failures include the full range
#           of problems resulting from implementation errors or an unreliable
#           connection.
#
# X.6.X --- Message Content or Media Status
#           The message content or media status codes report failures involving
#           the content of the message. These codes report failures due to
#           translation, transcoding, or otherwise unsupported message media.
#           Message content or media issues are under the control of both the
#           sender and the receiver, both of which must support a common set of
#           supported content-types.
#
# X.7.X --- Security or Policy Status
#           The security or policy status codes report failures involving policies
#           such as per-recipient or per-host filtering and cryptographic operations.
#           Security and policy status issues are assumed to be under the control
#           of either or both the sender and recipient.
#           Both the sender and recipient must permit the exchange of messages
#           and arrange the exchange of necessary keys and certificates for
#           cryptographic operations.
#
# ------------------------------------------------------------------------------
# [Enumerated Status Codes]
#
# X.0.0  Any    Other undefined Status:(RFC 3463)
#                 Other undefined status is the only undefined error code. It
#                 should be used for all errors for which only the class of the
#                 error is known.
#
# X.1.0  ---    Other address status:(RFC 3463)
#                 Something about the address specified in the message caused
#                 this DSN.
#
# X.1.1  451    Bad destination mailbox address:(RFC 3463)
#        550      The mailbox specified in the address does not exist.
#                 For Internet mail names, this means the address portion to the
#                 the left of the "@" sign is invalid.
#                 This code is only useful for permanent failures.
#
# X.1.2  ---    Bad destination system addres:
#                 The destination system specified in the address does not exist
#                 or is incapable of accepting mail. For Internet mail names,
#                 this means the address portion to the right of the "@" is
#                 invalid for mail.
#                 This code is only useful for permanent failures.
#
# X.1.3  501    Bad destination mailbox address syntax:
#                 The destination address was syntactically invalid. This can
#                 apply to any field in the address. This code is only useful
#                 for permanent failures.
#
# X.1.4  ---    Destination mailbox address ambiguous:(RFC 3463)
#                 The mailbox address as specified matches one or more recipients
#                 on the destination system.
#                 This may result if a heuristic address mapping algorithm is
#                 used to map the specified address to a local mailbox name.
#
# X.1.5  250    Destination address valid:(RFC 3463)
#                 This mailbox address as specified was valid. This status code
#                 should be used for positive delivery reports.
#
# X.1.6  ---    Destination mailbox has moved, No forwarding address:(RFC 3463)
#                 The mailbox address provided was at one time valid, but mail
#                 is no longer being accepted for that address.
#                 This code is only useful for permanent failures.
#
# X.1.7  ---    Bad sender's mailbox address syntax:(RFC 3463)
#                 The sender's address was syntactically invalid. This can apply
#                 to any field in the address.
#
# X.1.8  451    Bad sender's system address:(RFC 3463)
#        501      The sender's system specified in the address does not exist or
#                 is incapable of accepting return mail. For domain names, this
#                 means the address portion to the right of the "@" is invalid
#                 for mail.
#
# X.1.9  ---    Message relayed to non-compliant mailer:(RFC 5248, 3886)
#                 The mailbox address specified was valid, but the message has
#                 been relayed to a system that does not speak this protocol;
#                 no further information can be provided.
#
# X.1.10 ---    Recipient address has null MX:(RFC 7505)
#                 This status code is returned when the associated address is
#                 marked as invalid using a null MX.
# ------------------------------------------------------------------------------
# X.2.0  ---    Other or undefined mailbox status:(RFC 3463)
#                 The mailbox exists, but something about the destination mailbox
#                 has caused the sending of this DSN.
#
# X.2.1  ---    Mailbox disabled, not accepting messages:(RFC 3463)
#                 The mailbox exists, but is not accepting messages. This may be
#                 a permanent error if the mailbox will never be re-enabled or a
#                 transient error if the mailbox is only temporarily disabled.
#
# X.2.2  552    Mailbox full:(RFC 3463)
#                 The mailbox is full because the user has exceeded a per-mailbox
#                 administrative quota or physical capacity. The general semantics
#                 implies that the recipient can delete messages to make more
#                 space available.
#                 This code should be used as a persistent transient failure.
#
# X.2.3  552    Message length exceeds administrative limit:(RFC 3463)
#                 A per-mailbox administrative message length limit has been
#                 exceeded. This status code should be used when the per-mailbox
#                 message length limit is less than the general system limit.
#                 This code should be used as a permanent failure.
#
# X.2.4  450    Mailing list expansion problem:(RFC 3463)
#        452      The mailbox is a mailing list address and the mailing list was
#                 unable to be expanded. This code may represent a permanent
#                 failure or a persistent transient failure.
# ------------------------------------------------------------------------------
# X.3.0  221    Other or undefined mail system status:(RFC 3463)
#        250      The destination system exists and normally accepts mail, but
#        421,451  something about the system has caused the generation of this
#        550,554  DSN.
#
# X.3.1  452    Mail system full:(RFC 3463)
#                 Mail system storage has been exceeded. The general semantics
#                 imply that the individual recipient may not be able to delete
#                 material to make room for additional messages. This is useful
#                 only as a persistent transient error.
#
# X.3.2  453    System not accepting network messages:(RFC 3463)
#        521      The host on which the mailbox is resident is not accepting messages.
#                 Examples of such conditions include an imminent shutdown, excessive
#                 load, or system maintenance. This is useful for both permanent
#                 and persistent transient errors.
#
# X.3.3  ---    System not capable of selected features:(RFC 3463)
#                 Selected features specified for the message are not supported
#                 by the destination system. This can occur in gateways when
#                 features from one domain cannot be mapped onto the supported
#                 feature in another.
#
# X.3.4  552    Message too big for system:(RFC 3463)
#        554      The message is larger than per-message size limit. This limit
#                 may either be for physical or administrative reasons. This is
#                 useful only as a permanent error.
#
# X.3.5  ---    System incorrectly configured:(RFC 3463)
#                 The system is not configured in a manner that will permit it
#                 to accept this message.
# ------------------------------------------------------------------------------
# X.4.0  ---    Other or undefined network or routing status:(RFC 3463)
#                 Something went wrong with the networking, but it is not clear
#                 what the problem is, or the problem cannot be well expressed
#                 with any of the other provided detail codes.
#
# X.4.1  451    No answer from host:(RFC 3463)
#                 The outbound connection attempt was not answered, because either
#                 the remote system was busy, or was unable to take a call.
#                 This is useful only as a persistent transient error.
#
# X.4.2  421    Bad connection:(RFC 3463)
#                 The outbound connection was established, but was unable to
#                 complete the message transaction, either because of time-out,
#                 or inadequate connection quality. This is useful only as a
#                 persistent transient error.
#
# X.4.3  451    Directory server failure:(RFC 3463)
#        550      The network system was unable to forward the message, because
#                 a directory server was unavailable. This is useful only as a
#                 persistent transient error. The inability to connect to an
#                 Internet DNS server is one example of the directory server
#                 failure error.
#
# X.4.4  ---    Unable to route:(RFC 3463)
#                 The mail system was unable to determine the next hop for the
#                 message because the necessary routing information was unavailable
#                 from the directory server. This is useful for both permanent
#                 and persistent transient errors. A DNS lookup returning only
#                 an SOA (Start of Administration) record for a domain name is
#                 one example of the unable to route error.
#
# X.4.5  451    Mail system congestion:(RFC 3463)
#                 The mail system was unable to deliver the message because the
#                 mail system was congested. This is useful only as a persistent
#                 transient error.
#
# X.4.6  ---    Routing loop detected:(RFC 3463)
#                 A routing loop caused the message to be forwarded too many times,
#                 either because of incorrect routing tables or a user-forwarding
#                 loop. This is useful only as a persistent transient error.
#
# X.4.7  ---    Delivery time expired:(RFC 3463)
#                 The message was considered too old by the rejecting system,
#                 either because it remained on that host too long or because
#                 the time-to-live value specified by the sender of the message
#                 was exceeded. If possible, the code for the actual problem
#                 found when delivery was attempted should be returned rather
#                 than this code.
# ------------------------------------------------------------------------------
# X.5.0  220    Other or undefined protocol status:(RFC 3463)
#        250-253  Something was wrong with the protocol necessary to deliver the
#        451,452  message to the next hop and the problem cannot be well expressed
#        454,458  with any of the other provided detail codes.
#        459,554
#        501-503
#
# X.5.1  430    Invalid command:(RFC 3463)
#        500,501  A mail transaction protocol command was issued which was either
#        503,530  out of sequence or unsupported.
#        550,554  This is useful only as a permanent error.
#        555
#
# X.5.2  500    Syntax error:(RFC 3463)
#        500,501  A mail transaction protocol command was issued which could not
#        502,550  be interpreted, either because the syntax was wrong or the
#        555      command is unrecognized.
#                 This is useful only as a permanent error.
#
# X.5.3  451    Too many recipients:(RFC 3463)
#                 More recipients were specified for the message than could have
#                 been delivered by the protocol. This error should normally result
#                 in the segmentation of the message into two, the remainder of
#                 the recipients to be delivered on a subsequent delivery attempt.
#                 It is included in this list in the event that such segmentation
#                 is not possible.
#
# X.5.4  451    Invalid command arguments:(RFC 3463)
#        501-504  A valid mail transaction protocol command was issued with
#        550      invalid arguments, either because the arguments were out of
#        555      range or represented unrecognized features.
#                 This is useful only as a permanent error.
#
# X.5.5  ---    Wrong protocol version:(RFC 3463)
#                 A protocol version mis-match existed which could not be
#                 automatically resolved by the communicating parties.
#
# X.5.6  550    Authentication Exchange line is too long (RFC 4954)
#                 This enhanced status code SHOULD be returned when the server
#                 fails the AUTH command due to the client sending a [BASE64]
#                 response which is longer than the maximum buffer size available
#                 for the currently selected SASL mechanism. This is useful for
#                 both permanent and persistent transient errors.
# ------------------------------------------------------------------------------
# X.6.0  ---    Other or undefined media error:(RFC 3463)
#                 Something about the content of a message caused it to be considered
#                 undeliverable and the problem cannot be well expressed with
#                 any of the other provided detail codes.
#
# X.6.1  ---    Media not supported:(RFC 3463)
#                 The media of the message is not supported by either the delivery
#                 protocol or the next system in the forwarding path. This is
#                 useful only as a permanent error.
#
# X.6.2  ---    Conversion required and prohibited:(RFC 3463)
#                 The content of the message must be converted before it can be
#                 delivered and such conversion is not permitted. Such prohibitions
#                 may be the expression of the sender in the message itself or
#                 the policy of the sending host.
#
# X.6.3  554    Conversion required but not supported:(RFC 3463)
#                 The message content must be converted in order to be forwarded
#                 but such conversion is not possible or is not practical by a
#                 host in the forwarding path. This condition may result when
#                 an ESMTP gateway supports 8bit transport but is not able to
#                 downgrade the message to 7 bit as required for the next hop.
#
# X.6.4  250    Conversion with loss performed:(RFC 3463)
#                 This is a warning sent to the sender when message delivery was
#                 successfully but when the delivery required a conversion in
#                 which some data was lost. This may also be a permanent error
#                 if the sender has indicated that conversion with loss is
#                 prohibited for the message.
#
# X.6.5  ---    Conversion Failed:(RFC 3463)
#                 A conversion was required but was unsuccessful. This may be
#                 useful as a permanent or persistent temporary notification.
#
# X.6.6  554    Message content not available (RFC 4468)
#                 The message content could not be fetched from a remote system.
#                 This may be useful as a permanent or persistent temporary
#                 notification.
#
# X.6.7  553    The ALT-ADDRESS is required but not specified:(RFC 6531)
#        550      This indicates the reception of a MAIL or RCPT command that
#                 non-ASCII addresses are not permitted
#
# X.6.8  252    UTF-8 string reply is required, but not permitted by the client:(RFC 6531)
#        553      This indicates that a reply containing a UTF-8 string is required
#        550      to show the mailbox name, but that form of response is not permitted
#                 by the SMTP client.
#
# X.6.9  550    UTF8SMTP downgrade failed:(RFC 6531)
#                 This indicates that transaction failed after the final "." of
#                 the DATA command.
#
# X.6.10        This is a duplicate of X.6.8 and is thus deprecated.
# ------------------------------------------------------------------------------
# X.7.0  220    Other or undefined security status:(RFC 3463)
#        235      Something related to security caused the message to be returned,
#        450,454  and the problem cannot be well expressed with any of the other
#        500,501  provided detail codes. This status code may also be used when
#        503,504  the condition cannot be further described because of security
#        530,535  policies in force.
#        550
#
# X.7.1  451    Delivery not authorized, message refused:(RFC 3463)
#        454,502  The sender is not authorized to send to the destination. This
#        503,533  can be the result of per-host or per-recipient filtering. This
#        550,551  memo does not discuss the merits of any such filtering, but
#                 provides a mechanism to report such. This is useful only as
#                 a permanent error.
#
# X.7.2  550    Mailing list expansion prohibited:(RFC 3463)
#                 The sender is not authorized to send a message to the intended
#                 mailing list. This is useful only as a permanent error.
#
# X.7.3  ---    Security conversion required but not possible:(RFC 3463)
#                 A conversion from one secure messaging protocol to another was
#                 required for delivery and such conversion was not possible.
#                 This is useful only as a permanent error.
#
# X.7.4  504    Security features not supported:(RFC 3463)
#                 A message contained security features such as secure authentication
#                 that could not be supported on the delivery protocol. This is
#                 useful only as a permanent error.
#
# X.7.5  ---    Cryptographic failure:(RFC 3463)
#                 A transport system otherwise authorized to validate or decrypt
#                 a message in transport was unable to do so because necessary
#                 information such as key was not available or such information
#                 was invalid.
#
# X.7.6  ---    Cryptographic algorithm not supported:(RFC 3463)
#                 A transport system otherwise authorized to validate or decrypt
#                 a message was unable to do so because the necessary algorithm
#                 was not supported.

# X.7.7  ---    Message integrity failure:(RFC 3463)
#                 A transport system otherwise authorized to validate a message
#                 was unable to do so because the message was corrupted or altered.
#                 This may be useful as a permanent, transient persistent, or
#                 successful delivery code.
#
# X.7.8  535    Trust relationship required:(RFC 4954)
#        554      This response to the AUTH command indicates that the authentication
#                 failed due to invalid or insufficient authentication credentials.
#                 In this case, the client SHOULD ask the user to supply new credentials
#                 (such as by presenting a password dialog box).
#
# X.7.9  534    Authentication mechanism is too weak:(RFC 4954)
#                 This response to the AUTH command indicates that the selected
#                 authentication mechanism is weaker than server policy permits
#                 for that user. The client SHOULD retry with a new authentication
#                 mechanism.
#
# X.7.10 523    Encryption Needed:(RFC 5248)
#                 This indicates that external strong privacy layer is needed in
#                 order to use the requested authentication mechanism. This is
#                 primarily intended for use with clear text authentication mechanisms.
#                 A client which receives this may activate a security layer such
#                 as TLS prior to authenticating, or attempt to use a stronger
#                 mechanism.
#
# X.7.11 524    Encryption required for requested authentication mechanism:(RFC 4954)
#        538      This response to the AUTH command indicates that the selected
#                 authentication mechanism may only be used when the underlying
#                 SMTP connection is encrypted. Note that this response code is
#                 documented here for historical purposes only. Modern implementations
#                 SHOULD NOT advertise mechanisms that are not permitted due to
#                 lack of encryption, unless an encryption layer of sufficient
#                 strength is currently being employed.
#
# X.7.12 422    A password transition is needed:(RFC 4954)
#        432      This response to the AUTH command indicates that the user needs
#                 to transition to the selected authentication mechanism. This
#                 is typically done by authenticating once using the [PLAIN]
#                 authentication mechanism. The selected mechanism SHOULD then
#                 work for authentications in subsequent sessions.
#
# X.7.13 525    User Account Disabled:(RFC 5248)
#                 Sometimes a system administrator will have to disable a user's
#                 account (e.g., due to lack of payment, abuse, evidence of a
#                 break-in attempt, etc).
#                 This error code occurs after a successful authentication to a
#                 disabled account. This informs the client that the failure is
#                 permanent until the user contacts their system administrator
#                 to get the account re-enabled.
#                 It differs from a generic authentication failure where the
#                 client's best option is to present the passphrase entry dialog
#                 in case the user simply mistyped their passphrase.
#
# X.7.14 535    Trust relationship required:(RFC 5248)
#        554      The submission server requires a configured trust relationship
#                 with a third-party server in order to access the message content.
#                 This value replaces the prior use of X.7.8 for this error condition.
#                 thereby updating [RFC4468].
#
# X.7.15 450    Priority Level is too low:(RFC6710)
#        550      The specified priority level is below the lowest priority acceptable
#        4xx      for the receiving SMTP server. This condition might be temporary,
#        5xx      for example the server is operating in a mode where only higher
#                 priority messages are accepted for transfer and delivery, while
#                 lower priority messages are rejected.
#
# X.7.16 552    Message is too big for the specified priority:(RFC 6710)
#        4xx      The message is too big for the specified priority.
#        5xx      This condition might be temporary, for example the server is
#                 operating in a mode where only higher priority messages below
#                 certain size are accepted for transfer and delivery.
#
# X.7.17 5xx    Mailbox owner has changed:(RFC 6710)
#                 This status code is returned when a message is received with
#                 a Require-Recipient-Valid-Since field or RRVS extension and
#                 the receiving system is able to determine that the intended
#                 recipient mailbox has not been under continuous ownership since
#                 the specified date-time.
#
# X.7.18 5xx    Domain owner has changed:(RFC 7293)
#                 This status code is returned when a message is received with
#                 a Require-Recipient-Valid-Since field or RRVS extension and
#                 the receiving system wishes to disclose that the owner of the
#                 domain name of the recipient has changed since the specified
#                 date-time.
#
# X.7.19 5xx    RRVS test cannot be completed:(RFC 7293)
#                 This status code is returned when a message is received with
#                 a Require-Recipient-Valid-Since field or RRVS extension and
#                 the receiving system cannot complete the requested evaluation
#                 because the required timestamp was not recorded.
#                 The message originator needs to decide whether to reissue the
#                 message without RRVS protection.
#
# X.7.20 550    No passing DKIM signature found:(RFC 7372)
#                 This status code is returned when a message did not contain
#                 any passing DKIM signatures. (This violates the advice of
#                 Section 6.1 of [RFC6376].)
#
# X.7.21 550    No acceptable DKIM signature found:(RFC 7372, 6476)
#                 This status code is returned when a message contains one or
#                 more passing DKIM signatures, but none are acceptable.
#                 (This violates the advice of Section 6.1 of [RFC6376].)
#
# X.7.22 550    No valid author-matched DKIM signature found:(RFC 7372)
#                 This status code is returned when a message contains one or
#                 more passing DKIM signatures, but none are acceptable because
#                 none have an identifier(s) that matches the author address(es)
#                 found in the From header field.
#                 This is a special case of X.7.21. (This violates the advice of
#                 Section 6.1 of [RFC6376].)
#
# X.7.23 550    SPF validation failed:(RFC 7273, 7208)
#                 This status code is returned when a message completed an SPF
#                 check that produced a "fail" result, contrary to local policy
#                 requirements. Used in place of 5.7.1 as described in Section
#                 8.4 of [RFC7208].
#
# X.7.24 451    SPF validation error:(RFC 7372, 7208)
#        550      This status code is returned when evaluation of SPF relative
#                 to an arriving message resulted in an error. Used in place of
#                 4.4.3 or 5.5.2 as described in Sections 8.6 and 8.7 of [RFC7208].
#
# X.7.25 550    Reverse DNS validation failed:(RFC 7372, 7601)
#                 This status code is returned when an SMTP client's IP address
#                 failed a reverse DNS validation check, contrary to local policy
#                 requirements.
#
# X.7.26 550    Multiple authentication checks failed:(RFC 7372)
#                 This status code is returned when a message failed more than
#                 one message authentication check, contrary to local policy
#                 requirements. The particular mechanisms that failed are not
#                 specified.
#
# X.7.27 550    Sender address has null MX:(RFC 7505)
#                 This status code is returned when the associated sender address
#                 has a null MX, and the SMTP receiver is configured to reject
#                 mail from such sender (e.g., because it could not return a DSN).
# ------------------------------------------------------------------------------
# SAMPLES
#
#   554 5.5.0   No recipients have been specified
#   503 5.5.0   Valid RCPT TO required before BURL
#   554 5.6.3   Conversion required but not supported
#   554 5.3.4   Message too big for system
#   554 5.7.8   URL resolution requires trust relationship
#   552 5.2.2   Mailbox full
#   554 5.6.6   IMAP URL resolution failed
#   250 2.5.0   Waiting for additional BURL or BDAT commands
#   451 4.4.1   IMAP server unavailable
#   250 2.5.0   Ok.
#   250 2.6.4   MIME header conversion with loss performed
#   235 2.7.0   Authentication Succeeded
#   432 4.7.12  A password transition is needed
#   454 4.7.0   Temporary authentication failure
#   534 5.7.9   Authentication mechanism is too weak
#   535 5.7.8   Authentication credentials invalid
#   500 5.5.6   Authentication Exchange line is too long
#   530 5.7.0   Authentication required
#   538 5.7.11  Encryption required for requested authentication
#       5.7.8   Authentication credentials invalid
#       5.7.9   Authentication mechanism is too weak
#       5.7.11  Encryption required for requested authentication mechanism
# ------------------------------------------------------------------------------
#
use constant StandardCode => {
    '2.1.5'  => 'delivered',    # Successfully delivered
    # ------------------------------------------------------------------------------
    '4.1.6'  => 'hasmoved',     # Destination mailbox has moved, No forwarding address
    '4.1.7'  => 'rejected',     # Bad sender's mailbox address syntax
    '4.1.8'  => 'rejected',     # Bad sender's system address
    '4.1.9'  => 'systemerror',  # Message relayed to non-compliant mailer
    '4.2.1'  => 'suspend',      # Mailbox disabled, not accepting messages
    '4.2.2'  => 'mailboxfull',  # Mailbox full
    '4.2.3'  => 'exceedlimit',  # Message length exceeds administrative limit
    '4.2.4'  => 'filtered',     # Mailing list expansion problem
    #'4.3.0' => 'systemerror',  # Other or undefined mail system status
    '4.3.1'  => 'systemfull',   # Mail system full
    '4.3.2'  => 'notaccept',    # System not accepting network messages
    '4.3.3'  => 'systemerror',  # System not capable of selected features
    '4.3.5'  => 'systemerror',  # System incorrectly configured
    #'4.4.0' => 'networkerror', # Other or undefined network or routing status
    '4.4.1'  => 'expired',      # No answer from host
    '4.4.2'  => 'networkerror', # Bad connection
    #'4.4.3' => 'systemerror',  # Directory server failure
    '4.4.4'  => 'networkerror', # Unable to route
    '4.4.5'  => 'systemfull',  # Mail system congestion
    '4.4.6'  => 'networkerror', # Routing loop detected
    '4.4.7'  => 'expired',      # Delivery time expired
    #'4.5.0' => 'networkerror', # Other or undefined protocol status
    '4.5.3'  => 'systemerror',  # Too many recipients
    '4.5.5'  => 'systemerror',  # Wrong protocol version
    '4.6.0'  => 'contenterror', # Other or undefined media error
    '4.6.2'  => 'contenterror', # Conversion required and prohibited
    '4.6.5'  => 'contenterror', # Conversion Failed
    #'4.7.0' => 'securityerror',# Other or undefined security status
    '4.7.1'  => 'blocked',      # Delivery not authorized, message refused
    '4.7.2'  => 'blocked',      # Mailing list expansion prohibited
    '4.7.5'  => 'securityerror',# Cryptographic failure
    '4.7.6'  => 'securityerror',# Cryptographic algorithm not supported
    '4.7.7'  => 'securityerror',# Message integrity failure
    '4.7.12' => 'securityerror',# A password transition is needed
    '4.7.15' => 'securityerror',# Priority Level is too low
    '4.7.16' => 'mesgtoobig',   # Message is too big for the specified priority
    '4.7.24' => 'securityerror',# SPF validation error
    '4.7.25' => 'blocked',      # Reverse DNS validation failed
# ------------------------------------------------------------------------------
    '5.1.0'  => 'userunknown',  # Other address status
    '5.1.1'  => 'userunknown',  # Bad destination mailbox address
    '5.1.2'  => 'hostunknown',  # Bad destination system address
    '5.1.3'  => 'userunknown',  # Bad destination mailbox address syntax
    '5.1.4'  => 'filtered',     # Destination mailbox address ambiguous
    '5.1.6'  => 'hasmoved',     # Destination mailbox has moved, No forwarding address
    '5.1.7'  => 'rejected',     # Bad sender's mailbox address syntax
    '5.1.8'  => 'rejected',     # Bad sender's system address
    '5.1.9'  => 'systemerror',  # Message relayed to non-compliant mailer
    '5.1.10' => 'notaccept',    # Recipient address has null MX
    '5.2.0'  => 'filtered',     # Other or undefined mailbox status
    '5.2.1'  => 'filtered',     # Mailbox disabled, not accepting messages
    '5.2.2'  => 'mailboxfull',  # Mailbox full
    '5.2.3'  => 'exceedlimit',  # Message length exceeds administrative limit
    '5.2.4'  => 'filtered',     # Mailing list expansion problem
    '5.3.0'  => 'systemerror',  # Other or undefined mail system status
    '5.3.1'  => 'systemfull',   # Mail system full
    '5.3.2'  => 'notaccept',    # System not accepting network messages
    '5.3.3'  => 'systemerror',  # System not capable of selected features
    '5.3.4'  => 'mesgtoobig',   # Message too big for system
    '5.3.5'  => 'systemerror',  # System incorrectly configured
    '5.4.0'  => 'networkerror', # Other or undefined network or routing status
    '5.4.3'  => 'systemerror',  # Directory server failure
    '5.4.4'  => 'hostunknown',  # Unable to route
    '5.5.3'  => 'toomanyconn',  # Too many recipients
    '5.5.4'  => 'systemerror',  # Invalid command arguments
    '5.5.5'  => 'systemerror',  # Wrong protocol version
    '5.5.6'  => 'securityerror',# Authentication Exchange line is too long
    '5.6.0'  => 'contenterror', # Other or undefined media error
    '5.6.1'  => 'contenterror', # Media not supported
    '5.6.2'  => 'contenterror', # Conversion required and prohibited
    '5.6.3'  => 'contenterror', # Conversion required but not supported
    '5.6.5'  => 'contenterror', # Conversion Failed
    '5.6.6'  => 'contenterror', # Message content not available
    '5.6.7'  => 'contenterror', # Non-ASCII addresses not permitted for that sender/recipient
    '5.6.8'  => 'contenterror', # UTF-8 string reply is required, but not permitted by the SMTP client
    '5.6.9'  => 'contenterror', # UTF-8 header message cannot be transferred to one or more recipients
    '5.7.0'  => 'securityerror',# Other or undefined security status
    '5.7.1'  => 'securityerror',# Delivery not authorized, message refused
    '5.7.2'  => 'securityerror',# Mailing list expansion prohibited
    '5.7.3'  => 'securityerror',# Security conversion required but not possible
    '5.7.4'  => 'securityerror',# Security features not supported
    '5.7.5'  => 'securityerror',# Cryptographic failure
    '5.7.6'  => 'securityerror',# Cryptographic algorithm not supported
    '5.7.7'  => 'securityerror',# Message integrity failure
    '5.7.8'  => 'securityerror',# Authentication credentials invalid
    '5.7.9'  => 'securityerror',# Authentication mechanism is too weak
    '5.7.10' => 'securityerror',# Encryption Needed
    '5.7.11' => 'securityerror',# Encryption required for requested authentication mechanism
    '5.7.13' => 'suspend',      # User Account Disabled
    '5.7.14' => 'securityerror',# Trust relationship required
    '5.7.15' => 'securityerror',# Priority Level is too low
    '5.7.16' => 'mesgtoobig',   # Message is too big for the specified priority
    '5.7.17' => 'hasmoved',     # Mailbox owner has changed
    '5.7.18' => 'hasmoved',     # Domain owner has changed
    '5.7.19' => 'securityerror',# RRVS test cannot be completed
    '5.7.20' => 'securityerror',# No passing DKIM signature found
    '5.7.21' => 'securityerror',# No acceptable DKIM signature found
    '5.7.22' => 'securityerror',# No valid author-matched DKIM signature found
    '5.7.23' => 'securityerror',# SPF validation failed
    '5.7.24' => 'securityerror',# SPF validation error
    '5.7.25' => 'blocked',      # Reverse DNS validation failed
    '5.7.26' => 'securityerror',# Multiple authentication checks failed
    '5.7.27' => 'notaccept',    # MX resource record of a destination host is Null MX: RFC7505
};

use constant InternalCode => {
    'temporary' => {
        'blocked'      => '4.0.971',
        'contenterror' => '4.0.960',
        #'exceedlimit'  => '4.0.923',
        'expired'      => '4.0.947',
        'filtered'     => '4.0.924',
        #'hasmoved'     => '4.0.916',
        #'hostunknown'  => '4.0.912',
        'mailboxfull'  => '4.0.922',
        #'mailererror'  => '4.0.939',
        #'mesgtoobig'   => '4.0.934',
        'networkerror' => '4.0.944',
        #'norelaying'   => '4.0.909',
        'notaccept'    => '4.0.932',
        'onhold'       => '4.0.901',
        'rejected'     => '4.0.918',
        'securityerror'=> '4.0.970',
        'spamdetected' => '4.0.980',
        #'suspend'      => '4.0.921',
        'systemerror'  => '4.0.930',
        'systemfull'   => '4.0.931',
        'toomanyconn'  => '4.0.945',
        #'userunknown'  => '4.0.911',
        'undefined'    => '4.0.900',
    },
    'permanent' => {
        'blocked'        => '5.0.971',
        'contenterror'   => '5.0.960',
        'exceedlimit'    => '5.0.923',
        'expired'        => '5.0.947',
        'filtered'       => '5.0.910',
        'hasmoved'       => '5.0.916',
        'hostunknown'    => '5.0.912',
        'mailboxfull'    => '5.0.922',
        'mailererror'    => '5.0.939',
        'mesgtoobig'     => '5.0.934',
        'networkerror'   => '5.0.944',
        'norelaying'     => '5.0.909',
        'notaccept'      => '5.0.932',
        'onhold'         => '5.0.901',
        'policyviolation'=> '5.0.972',
        'rejected'       => '5.0.918',
        'securityerror'  => '5.0.970',
        'spamdetected'   => '5.0.980',
        'suspend'        => '5.0.921',
        'systemerror'    => '5.0.930',
        'systemfull'     => '5.0.931',
        'syntaxerror'    => '5.0.902',
        'toomanyconn'    => '5.0.945',
        'userunknown'    => '5.0.911',
        'undefined'      => '5.0.900',
        'virusdetected'  => '5.0.971',
    },
};

sub code {
    # Convert from the reason string to the internal status code
    # @param    [String]  argv1 Reason name
    # @param    [Integer] argv2 0: Permanent error
    #                           1: Temporary error
    # @return   [String]        D.S.N. or empty if the 1st argument is missing
    # @see      name
    # @since v4.14.0
    my $class = shift;
    my $argv1 = shift || return undef;
    my $argv2 = shift // 0;
    my $table = undef;
    my $code0 = undef;

    $table = $argv2 ? InternalCode->{'temporary'} : InternalCode->{'permanent'};
    $code0 = $table->{ $argv1 } // InternalCode->{'permanent'}->{ $argv1 } // '';
    return $code0;
}

sub name {
    # Convert from the status code to the reason string
    # @param    [String] state  Status code(DSN)
    # @return   [String]        Reason name or empty if the first argument did
    #                           not match with values in Sisimai's reason list
    # @see      code
    # @since v4.14.0
    my $class = shift;
    my $argv1 = shift || return undef;

    return '' unless $argv1 =~ /\A[245][.]\d[.]\d+\z/;
    return StandardCode->{ $argv1 } // '';
}

sub find {
    # Get a DSN code value from given string including DSN
    # @param    [String] argv1  String including DSN
    # @return   [String]        DSN or empty string if the first agument did
    #                           not include DSN
    # @since v4.14.0
    my $class = shift;
    my $argv1 = shift || return undef;
    my $found = '';

    state $regularexp = [
        qr/[ ]?[(][#]([45][.]\d[.]\d+)[)]?[ ]?/,    # #5.5.1
        qr/\b\d{3}[ -][#]?([45][.]\d[.]\d+)\b/,     # 550-5.1.1 OR 550 5.5.1
        qr/\b([45][.]\d[.]\d+)\b/,                  # 5.5.1
        qr/\b(2[.][0-7][.][0-7])\b/,                # 2.1.5
    ];

    for my $e ( @$regularexp ) {
        # Get the value of DSN in the text
        next unless $argv1 =~ $e;
        $found = $1;

        if( $argv1 =~ /\b(?:${found}[.]\d{1,3}|\d{1,3}[.]${found})\b/ ) {
            # Clear and skip if the value is an IPv4 address
            $found = '';
            next;
        }
        last;
    }
    return $found;
}

1;
__END__