Module: Sisimai::Rhost::Google

Defined in:

lib/sisimai/rhost/google.rb

Overview

Sisimai::Rhost detects the bounce reason from the content of Sisimai::Fact object as an argument of find() method when the value of “rhost” of the object is “aspmx.l.google.com”. This class is called only Sisimai::Fact class.

Constant Summary

MessagesOf =

{
  'authfailure' => [
    # - 451 4.7.24 The SPF record of the sending domain has one or more suspicious entries.
    #   To protect our users from spam, mail sent from your IP address has been temporarily
    #   rate limited. For more information, go to Email sender guidelines.
    #   https://support.google.com/mail/answer/81126#authentication
    #   
    # - 550 5.7.24 The SPF record of the sending domain has one or more suspicious entries.
    #   For more information, go to Email sender guidelines.
    # - https://support.google.com/mail/answer/81126#authentication
    ['451', '4.7.24', 'the spf record of the sending domain'],
    ['550', '5.7.24', 'the spf record of the sending domain'],

    # - 421 4.7.26 This mail has been rate limited because it is unauthenticated.
    #   Gmail requires all senders to authenticate with either SPF or DKIM.
    #   Authentication results: DKIM = did not pass SPF domain-name with ip: ip-address =
    #   did not pass. To resolve this issue, go to Email sender guidelines. 
    # - https://support.google.com/mail/answer/81126#authentication
    ['421', '4.7.26', 'senders to authenticate with either spf or dkim'],
    ['550', '5.7.26', 'senders to authenticate with either spf or dkim'],

    # - 550 5.7.26 This message fails to pass SPF checks for an SPF record with a hard fail
    #   policy (-all). To best protect our users from spam and phishing, the message has
    #   been blocked. Please visit https://support.google.com/mail/answer/81126 for more
    #   information.
    #
    # - 550 5.7.26 The MAIL FROM domain [domain-name] has an SPF record with a hard fail
    #   policy (-all) but it fails to pass SPF checks with the ip: [ip-address]. To best
    #   protect our users from spam and phishing, the message has been blocked. For more
    #   information, go to Email sender guidelines.
    # - https://support.google.com/mail/answer/81126#authentication
    ['550', '5.7.26', 'fails to pass spf checks for an spf record with a hard fail'],
    ['550', '5.7.26', 'has an spf record with a hard fail policy'],

    # - 451 4.7.26 Unauthenticated email from domain-name is not accepted due to domain's
    #   DMARC policy, but temporary DNS failures prevent authentication. Please contact the
    #   administrator of domain-name domain if this was a legitimate mail. To learn about
    #   the DMARC initiative, go to https://support.google.com/mail/?p=DmarcRejection
    ['451', '4.7.26', "is not accepted due to domain's dmarc policy"],
    ['550', '5.7.26', "is not accepted due to domain's dmarc policy"],

    # - 550 5.7.26 Unauthenticated email from domain-name is not accepted due to domain's
    #   DMARC policy. Please contact the administrator of domain-name domain. If this was
    #   a legitimate mail please visit [Control unauthenticated mail from your domain] to
    #   learn about the DMARC initiative. If the messages are valid and aren't spam, con-
    #   tact the administrator of the receiving mail server to determine why your outgoing
    #   messages don't pass authentication checks.
    ['550', '5.7.26', "is not accepted due to domain's dmarc policy"],

    # - 550 5.7.26 This message does not have authentication information or fails to pass
    #   authentication checks (SPF or DKIM). To best protect our users from spam, the mes-
    #   sage has been blocked. Please visit https://support.google.com/mail/answer/81126
    #   for more information.
    ['550', '5.7.1',  'fails to pass authentication checks'],
    ['550', '5.7.26', 'fails to pass authentication checks'],

    # - 421 4.7.27 Your email has been rate limited because SPF authentication didn't pass
    #   for this message. Gmail requires all bulk email senders to authenticate their emaili
    #   with SPF. Authentication results: SPF domain-name with IP address: ip-address = Did
    #   not pass.
    ['421', '4.7.27', 'senders to authenticate with spf'],
    ['421', '4.7.27', 'senders to authenticate their email with spf'],
    ['550', '5.7.27', 'senders to authenticate with spf'],

    # - 421 4.7.30 Your email has been rate limited because DKIM authentication didn't pass
    #   for this message. Gmail requires all email bulk senders to authenticate their email
    #   with DKIM. Authentication results: DKIM = Did not pass.
    ['421', '4.7.30', 'senders to authenticate their email with dkim'],

    # - 550 5.7.30 This mail has been blocked because DKIM does not pass. Gmail requires all
    #   large senders to authenticate with DKIM. Authentication results: DKIM = did not pass.
    #   For instructions on setting up DKIM authentication, go to Turn on DKIM for your domain.   
    ['550', '5.7.30', 'senders to authenticate with dkim'],

    # - 421 4.7.32 Your email has been rate limited because the From: header (RFC5322) in
    #   this message isn't aligned with either the authenticated SPF or DKIM organizational
    #   domain.
    # - 421 5.7.32 Your email was blocked because the From: header (RFC5322) in this message
    #   isn't aligned with either the authenticated SPF or DKIM organizational domain.
    ['421', '4.7.32', 'aligned with either the authenticated spf or dkim'],
    ["421", "5.7.32", "aligned with either the authenticated spf or dkim"],

    # - 421 4.7.40 Your email has been rate limited because the sending domain doesn't
    #   have a DMARC record, or the DMARC record doesn’t specify a DMARC policy. Gmail
    #   requires all bulk email senders to add a DMARC record to their sending domain.
    # - 550 5.7.40 Your message was blocked because the sending domain doesn't have a DMARC
    #   record or the DMARC record doesn't specify a DMARC policy. Gmail requires all bulk
    #   email senders to add a DMARC record to their sending domain.
    ["421", "4.7.40", "to add a dmarc record to "],
    ["550", "5.7.40", "to add a dmarc record to "],
  ],
  'badreputation' => [
    # - 421 4.7.0 This message is suspicious due to the very low reputation of the sending
    #   IP address/domain. To protect our users from spam, mail sent from your IP address
    #   has been temporarily rate limited. For more information, go to Why has Gmail blocked
    #   my messages?. https://support.google.com/mail/answer/188131
    ['421', '4.7.0', 'very low reputation of the sending ip address'],
    ['421', '4.7.0', 'very low reputation of the sending domain'],

    # - 550 5.7.1 Our system has detected that this message is likely suspicious due to the
    #   very low reputation of the sending IP address/domain. To best protect our users
    #   from spam, the message has been blocked. 
    #   Please visit https://support.google.com/mail/answer/188131 for more information.
    ['550', '5.7.1', 'this message is likely suspicious due to the very low reputation of the sending ip address'],
    ['550', '5.7.1', 'this message is likely suspicious due to the very low reputation of the sending domain'],
  ],
  'blocked' => [
    # - 421 4.7.0 IP not in whitelist for RCPT domain, closing connection.
    #   For more information, go to Allowlists, denylists, and approved senders.
    #   https://support.google.com/a/answer/60752
    ['421', '4.7.0', 'ip not in whitelist for rcpt domain'],

    # - 421 4.7.0 Try again later, closing connection. This usually indicates a Denial of
    #   Service (DoS) for the SMTP relay at the HELO stage.
    #   https://support.google.com/a/answer/3221692
    ['421', '4.7.0', 'try again later, closing connection.'],

    # - 501 5.5.4 HELO/EHLO argument is invalid. https://support.google.com/mail/?p=helo
    ['501', '5.5.4', 'empty helo/ehlo argument not allowed'],
    ['501', '5.5.4', 'helo/ehlo argument is invalid'],

    # - 421 4.7.28 Gmail has detected an unusual rate of mail
    #   (originating from)
    #       - your IP address 192.0.2.25
    #       - your IP Netblock 192.0.2.0/24 (?)
    #       - your DKIM domain example.org
    #       - your SPF domain example.org
    #   (containing one of your URL domains)
    #
    #   To protect our users from spam, mail has been temporarily rate limited. To review
    #   our bulk email senders guidelines, go to Email sender guidelines.
    #   https://support.google.com/mail/?p=UnsolicitedRateLimitError
    ['421', '4.7.0',  'an unusual rate of unsolicited mail'],
    ['421', '4.7.28', 'an unusual rate of mail'],

    # - 550 5.7.1 Our system has detected an unusual rate of unsolicited mail originating
    #   from your IP address. To protect our users from spam, mail sent from your IP ad-
    #   dress has been blocked. Review https://support.google.com/mail/answer/81126
    #
    # - 550 5.7.28 There is an unusual rate of unsolicited mail originating from your IP
    #   address. To protect our users from spam, mail sent from your IP address has been
    #   blocked. To review our bulk email senders guidelines, go to Email sender guidelines.
    ['550', '5.7.1',  'an unusual rate of unsolicited mail'],
    ['550', '5.7.28', 'an unusual rate of unsolicited mail'],
  ],
  'contenterror' => [
    # - 552 5.7.0 Our system detected an illegal attachment on your message. Please visit
    #   http://mail.google.com/support/bin/answer.py?answer=6590 to review our attachment
    #   guidelines.
    ['552', '5.7.0', 'illegal attachment on your message'],

    # - 552 5.7.0 This message was blocked because its content presents a potential securi-
    #   ty issue. Please visit https://support.google.com/mail/?p=BlockedMessage to review
    #   our message content and attachment content guidelines.
    ['552', '5.7.0', 'blocked because its content presents a potential security issue'],
  ],
  'emailtoolarge' => [
    # - 552 5.2.3 Your message exceeded Google's message size limits. For more information,
    #   visit https://support.google.com/mail/answer/6584
    ['552', '5.2.3', "your message exceeded google's message size limits"],

    # - 552 5.3.4 The number of attachments (num-attachments) exceeds Google's limit of
    #   limit attachments. To view our attachment size guidelines, go to Gmail receiving
    #   limits in Google Workspace. https://support.google.com/a/answer/1366776
    #
    # - 552 5.3.4 The size of the <header name> header value (size bytes) exceeds Google's
    #   limit of limit bytes per individual header size. To view our header size guidelines,
    #   go to Gmail message header limits https://support.google.com/a?p=header-limits
    #
    # - 552 5.3.4 Your message exceeded Google's message size limits. To view our message
    #   size guidelines, go to Send attachments with your Gmail message.
    # - https://support.google.com/mail/?p=MaxSizeError
    #
    # - 552 5.3.4 The size of your message (size bytes) exceeded Google's message size
    #   limits of limit bytes. To view our message size guidelines, go to Gmail receiving
    #   limits in Google Workspace.
    # - https://support.google.com/mail/?p=MaxSizeError
    ['552', '5.3.4', "your message exceeded google's message header size limits"],
    ['552', '5.3.4', 'bytes per individual header size'],
    ['552', '5.3.4', "exceeds google's limit of limit attachments."],
    ['552', '5.3.4', "exceeds google's header name limit of"],
    ['552', '5.3.4', "exceeds google's message size limit of"],
    ['552', '5.3.4', "exceeds google's message header size limit"],
    ['552', '5.3.4', "exceeded google's message size limits"],
  ],
  'expired' => [
    # - 421 4.7.0 Connection expired, try reconnecting. For more information, go to About
    # SMTP error messages. https://support.google.com/a/answer/3221692
    ['421', '4.7.0', 'connection expired'],

    # - 451 4.4.2 Timeout - closing connection. For more information, go to About SMTP
    #   error messages. https://support.google.com/a/answer/3221692
    ['451', '4.4.2', 'timeout - closing connection'],
  ],
  'failedstarttls' => [
    # - 530 5.7.0 Must issue a STARTTLS command first. For more information, go to About
    #   SMTP error messages and review RFC 3207 specifications.
    ['530', '5.7.0', 'must issue a starttls command first'],
    ['454', '5.5.1', 'starttls may not be repeated'],

    # - 421 4.7.0 TLS required for RCPT domain, closing connection. For more information,
    #   go to Email encryption in transit. https://support.google.com/mail/answer/6330403
    ['421', '4.7.0', 'tls required for rcpt domain'],

    # - 421 4.7.29 Your email has been rate limited because this message wasn't sent over a
    #   TLS connection. Gmail requires all bulk email senders to use TLS/SSL for SMTP conn-
    #   ections.
    ['421', '4.7.29', 'senders to use tls/ssl for smtp'],
    ['550', '5.7.29', 'senders to use tls/ssl for smtp'],
  ],
  'mailboxfull' => [
    # - 452 4.2.2 The recipient's inbox is out of storage space.
    #   Please direct the recipient to https://support.google.com/mail/?p=OverQuotaTemp
    # - Please direct the recipient to https://support.google.com/mail/?p=OverQuotaPerm
    ['452', '4.2.2', 'inbox is out of storage space'],
    ['552', '5.2.2', 'inbox is out of storage space and inactive'],

    # - 452 4.2.2 The email account that you tried to reach is over quota. Please direct
    #   the recipient to Clear Google Drive space & increase storage.
    ['452', '4.2.2', 'is over quota'],
    ['552', '5.2.2', 'is over quota'],
    ['550', '5.7.1', 'email quota exceeded'],
  ],
  'networkerror' => [
    # - 554 5.4.6 Message exceeded 50 hops, this may indicate a mail loop.
    #   For more information, go to Gmail Help. https://support.google.com/mail/?p=MailLoop
    ['554', '5.4.6', 'message exceeded 50 hops'],
    ['554', '5.6.0', 'message exceeded 50 hops'],
  ],
  'norelaying' => [
    # - 550 5.7.0 Mail relay denied <ip-address>. Invalid credentials for relay for one of
    #   the domains in: <domain-name> (as obtained from HELO and MAIL FROM). Email is being
    #   sent from a domain or IP address which isn't registered in your Workspace account.
    #   Please login to your Workspace account and verify that your sending device IP
    #   address has been registered within the Workspace SMTP Relay Settings. For more
    #   information, go to SMTP relay service error messages. 
    # - https://support.google.com/a/answer/6140680#maildenied
    ['550', '5.7.0', 'mail relay denied'],

    # - 550 5.7.1 Invalid credentials for relay <ip-address>. The IP address you've
    #   registered in your Workspace SMTP Relay service doesn't match the domain of the
    #   account this email is being sent from. If you are trying to relay mail from a
    #   domain that isn't registered under your Workspace account or has empty
    #   envelope-from:, you must configure your mail server either to use SMTP AUTH to
    #   identify the sending domain or to present one of your domain names in the HELO or
    #   EHLO command. For more information, go to SMTP relay service error messages. 
    # - https://support.google.com/a/answer/6140680#invalidcred
    ['550', '5.7.1', 'invalid credentials for relay'],

    # - 550 7.7.1 The IP you're using to send mail is not authorized to send email directly
    #   to our servers. Use the SMTP relay at your service provider instead. For more
    #   information, go to 'The IP you're using to send email is not authorized...'. 
    # - https://support.google.com/mail/?p=NotAuthorizedError
    ['550', '5.7.1', 'is not authorized to send email directly to our servers'],
  ],
  'notcompliantrfc' => [
    # - 550 5.7.1 Messages missing a valid address in the From: header, or having no From:
    #   header, are not accepted. For more information, go to Email sender guidelines and
    #   review RFC 5322 specifications.
    # - https://support.google.com/mail/?p=RfcMessageNonCompliant
    ['550', '5.7.1', 'missing a valid address in the from: header'],
    ['550', '5.7.1', 'multiple addresses in from: header are not accepted'],

    # - 550 5.7.1 This message is not RFC 5322 compliant because it has duplicate headers.
    #   To reduce the amount of spam sent to Gmail, this message has been blocked. For more
    #   information, go to Email sender guidelines and review RFC 5322 specifications.
    # - https://support.google.com/mail/?p=RfcMessageNonCompliant
    ['550', '5.7.1', 'is not rfc 5322 compliant'],

    # - 550 5.7.1 Messages missing a valid Message-ID: header are not accepted. For more
    #   information, go to Email sender guidelines and review RFC 5322 specifications.
    # - https://support.google.com/mail/?p=RfcMessageNonCompliant
    ['550', '5.7.1', 'missing a valid message-id: header'],

    # - 550 5.7.1 The message contains a unicode character in a disallowed header.
    #   To review our message and header content guidelines, go to File types blocked in
    #   Gmail. https://support.google.com/mail/?p=BlockedMessage
    ['550', '5.7.1', 'contains a unicode character in a disallowed header'],

    # - 550 5.7.1 Encoded-word syntax is not permitted in message header header-name. To
    #   reduce the amount of spam sent to Gmail, this message has been blocked. For more
    #   information, go to Email sender guidelines and review RFC 5322 specifications.
    # - https://support.google.com/mail/?p=RfcMessageNonCompliant
    ['550', '5.7.1', 'encoded-word syntax is not permitted'],

    # - 553 5.1.7 The sender address address is not a valid RFC 5321 address. For more
    #   information, go to About SMTP error messages and review RFC 5321 specifications.
    # - https://support.google.com/a/answer/3221692
    ['553', '5.1.7', 'is not a valid rfc 5321 address'],

    # - 554 5.6.0 Mail message is malformed. Not accepted. For more information, go to
    #   Email sender guidelines and review RFC 5322 specifications.
    # - https://support.google.com/mail/?p=RfcMessageNonCompliant
    ['554', '5.6.0', 'mail message is malformed'],
  ],
  'policyviolation' => [
    # - 550 5.7.1 The user or domain that you are sending to (or from) has a policy that
    #   prohibited the mail that you sent. Please contact your domain administrator for
    #   further details.
    #   For more information, visit https://support.google.com/a/answer/172179
    ['550', '5.7.1', 'you are sending to (or from) has a policy that prohibited'],
  ],
  'ratelimited' => [
    # - 450 4.2.1 The user you are trying to contact is receiving mail too quickly. Please
    #   resend your message at a later time. If the user is able to receive mail at that
    #   time, your message will be delivered. 
    #   For more information, visit https://support.google.com/mail/answer/22839
    #
    # - 450 4.2.1 Peak SMTP relay limit exceeded for customer. This is a temporary error.
    #   For more information on SMTP relay limits, please contact your administrator or
    #   visit https://support.google.com/a/answer/6140680
    ['450', '4.2.1', 'is receiving mail too quickly'],
    ['450', '4.2.1', 'peak smtp relay limit exceeded for customer'],

    # - 450 4.2.1 The user you are trying to contact is receiving mail at a rate that pre-
    #   vents additional messages from being delivered. Please resend your message at a
    #   later time. If the user is able to receive mail at that time, your message will be
    #   delivered. For more information, visit https://support.google.com/mail/answer/6592
    # - https://support.google.com/mail/?p=ReceivingRatePerm
    ['450', '4.2.1', 'rate that prevents additional messages from being delivered'],
    ['550', '5.2.1', 'rate that prevents additional messages from being delivered'],

    # - 452 4.5.3 Your message has too many recipients. For more information regarding
    #   Google's sending limits, visit https://support.google.com/mail/answer/6592
    #   https://support.google.com/mail/?p=TooManyRecipientsError
    ['452', '4.5.3', 'your message has too many recipients'],
    ['550', '5.5.3', 'too many recipients for this sender'],

    # - 550 5.4.5 Daily SMTP relay limit exceeded for user. For more information on SMTP
    #   relay sending limits please contact your administrator or visit SMTP relay service
    #   error messages.
    #   https://support.google.com/a/answer/6140680
    # - https://support.google.com/a/answer/166852
    ['550', '5.4.5', 'daily sending quota exceeded'],
    ['550', '5.4.5', 'daily user sending limit exceeded'],
    ['550', '5.4.5', 'daily smtp relay limit exceeded for'],
    ['550', '5.7.1', 'daily smtp relay limit exceeded for'],
    ['550', '5.7.1', 'daily smtp relay sending limit exceeded for'],
    ['550', '5.7.1', 'this mail has been rate limited'],

    # - 421 4.7.28 Gmail has detected this message exceeded its quota for sending messages
    #   with the same Message-ID:. To best protect our users, the message has been tempo-
    #   rarily rejected. For more information, go to Why has Gmail blocked my messages?.
    #   https://support.google.com/mail/answer/188131
    ['421', '4.7.28', 'sending messages with the same message-id:'],
  ],
  'rejected' => [
    # - 550 5.7.0, Mail Sending denied. This error occurs if the sender account is disabled
    #   or not registered within your Google Workspace domain.
    # - https://support.google.com/a/answer/6140680#maildenied
    ['550', '5.7.0', 'mail sending denied'],
    ['550', '5.7.1', 'unauthenticated email is not accepted'],
  ],
  'requireptr' => [
    # - 550 5.7.1 This message does not meet IPv6 sending guidelines regarding PTR records
    #   and authentication. For more information, go to Email sender guidelines.
    #   https://support.google.com/mail/?p=IPv6AuthError
    ['550', '5.7.1', 'does not meet ipv6 sending guidelines regarding ptr records and authentication'],

    # - 421 4.7.0 The IP address sending this message does not have a PTR record, or the
    #   corresponding forward DNS entry does not point to the sending IP. To protect our
    #   users from spam, mail sent from your IP address has been temporarily rate limited.
    #   For more information, go to Email sender guidelines.
    ['421', '4.7.0',  'does not have a ptr record'],

    # - 421 4.7.23 The sending IP address for this message doesn't have a PTR record, or
    #   the PTR record's forward DNS entry doesn't match the sending IP address. To protect
    #   users from spam, your email has been temporarily rate limited.
    ['421', '4.7.23', ' have a ptr record, or the ptr record'],

    # - 550 5.7.25 The IP address sending this message does not have a PTR record setup, or
    #   the corresponding forward DNS entry does not point to the sending IP. As a policy,
    #   Gmail does not accept messages from IPs with missing PTR records.
    #   For more information, go to Email sender guidelines.
    # - https://support.google.com/mail/answer/81126#ip-practices
    #
    # - 550 5.7.25 The sending IP does not match the IP address of the hostname specified
    #   in the pointer (PTR) record. For more information, go to Email sender guidelines.
    # - https://support.google.com/mail/answer/81126#ip-practices
    ['550', '5.7.25', 'does not have a ptr record'],
    ['550', '5.7.25', 'does not match the ip address of the hostname'],
  ],
  'securityerror' => [
    # - 454 4.7.0 Too many login attempts, please try again later. For more information, go
    #   to Add Gmail to another email client. https://support.google.com/mail/answer/7126229
    ['454', '4.7.0', 'too many login attempts'],

    # - 503 5.7.0 No identity changes permitted. For more information, go to About SMTP
    #   error messages.
    ['501', '5.5.2', 'cannot decode response'],   # 2FA related error, maybe.
    ['503', '5.7.0', 'no identity changes permitted'],

    # - 530 5.5.1 Authentication Required. For more information, visit
    #   https://support.google.com/accounts/troubleshooter/2402620
    # - https://support.google.com/mail/?p=WantAuthError
    ['530', '5.5.1', 'authentication required.'],
    ['530', '5.7.0', 'authentication required.'],

    # - 535 5.7.1 Application-specific password required.
    #   For more information, visit https://support.google.com/accounts/answer/185833
    ['535', '5.7.1',  'application-specific password required'],
    ['535', '5.7.90', 'application-specific password required'],

    # - 535 5.7.1 Please log in with your web browser and then try again. For more infor-
    #   mation, visit https://support.google.com/mail/bin/accounts/answer/78754
    ['535', '5.7.1',  'please log in with your web browser'],
    ['534', '5.7.90', 'please log in with your web browser'],
    ['534', '5.7.14', 'please log in through your web browser'],

    # - 535 5.7.1 Username and Password not accepted. For more information, visit 
    #   https://support.google.com/accounts/troubleshooter/2402620
    ['535', '5.7.1',  'username and password not accepted'],
    ['535', '5.7.80', 'username and password not accepted'],
  ],
  'spamdetected' => [
    # - 421 4.7.0 This message is suspicious due to the nature of the content or the links
    #   within. To best protect our users from spam, the message has been blocked. For more
    #   information, go to Why has Gmail blocked my messages?.
    #   https://support.google.com/mail/answer/188131
    ['421', '4.7.0', 'due to the nature of the content or the links within'],

    # - 550 5.7.1 Our system has detected that this message is likely unsolicited mail. To
    #   reduce the amount of spam sent to Gmail, this message has been blocked.
    #   For more information, visit https://support.google.com/mail/answer/188131
    # - https://support.google.com/mail/?p=UnsolicitedMessageError
    ['550', '5.7.1', 'likely unsolicited mail'],
  ],
  'suspend' => [
    # - 550 5.2.1 The email account that you tried to reach is inactive.
    #   For more information, go to https://support.google.com/mail/?p=DisabledUser
    ['550', '5.2.1', 'account that you tried to reach is disabled'],
    ['550', '5.2.1', 'account that you tried to reach is inactive'],
  ],
  'syntaxerror' => [
    # - 523 5.7.10 SMTP protocol violation, no commands allowed to pipeline after STARTTLS.
    #   For more information, go to About SMTP error messages and review RFC 3207
    #   specifications.
    ['451', '4.5.0',  'smtp protocol violation'],
    ['454', '4.5.0',  'smtp protocol violation'],
    ['525', '5.7.10', 'smtp protocol violation'],
    ['535', '5.5.4',  'optional argument not permitted'],

    # - 501 5.5.2 Syntax error, cannot decode response. For more information, go to About
    #   SMTP error messages.
    # - https://support.google.com/a/answer/3221692
    # - 501 5.7.11 Syntax error (no parameters allowed). For more information, go to About
    #   SMTP error messages and review RFC 3207 specifications.
    ['501', '5.7.11', 'syntax error'],
    ['501', '5.5.2',  'syntax error'],
    ['555', '5.5.2',  'syntax error'],

    # - 503 5.5.1 Bad sequence of commands. For more information, go to About SMTP error
    #   messages and review RFC 5321 specifications.
    # - https://support.google.com/mail/?p=helo
    #
    # - 503 5.5.1 No DATA after BDAT. A mail transaction protocol command was issued out of
    #   sequence. For more information, go to About SMTP error messages and review RFC 3030
    #   specifications.
    # - https://support.google.com/a/answer/3221692
    ['502', '5.5.1',  'too many unrecognized commands, goodbye'],
    ['502', '5.5.1',  'unimplemented command'],
    ['502', '5.5.1',  'unrecognized command'],
    ['503', '5.5.1',  'bad sequence of commands'],
    ['503', '5.5.1',  'ehlo/helo first'],
    ['503', '5.5.1',  'mail first'],
    ['503', '5.5.1',  'rcpt first'],
    ['503', '5.5.1',  'no data after bdat'],
    ['504', '5.7.40', 'unrecognized authentication type'],
    ['504', '5.7.40', 'xoauth is no longer supported'],
    ['554', '5.7.0',  'too many unauthenticated commands'],
  ],
  'systemerror' => [
    # About SMTP error messages, https://support.google.com/a/answer/3221692
    ['421', '4.3.0', 'temporary system problem'],
    ['421', '4.7.0', 'temporary system problem'],
    ['421', '4.4.5', 'server busy'],

    # - 451 4.3.0 Multiple destination domains per transaction is unsupported. Please try
    #   again. For more information, go to About SMTP error messages and review RFC 5321
    #   specifications. https://support.google.com/a/answer/3221692
    ['451', '4.3.0', 'multiple destination domains per transaction is unsupported'],
    ['451', '4.3.0', 'mail server has temporarily rejected this message'],
    ['451', '4.3.0', 'mail server temporarily rejected message'],

    # - 452 4.5.3 Domain policy size per transaction exceeded, please try this recipient in
    #   a separate transaction. This message means the email policy size (size of policies,
    #   number of policies, or both) for the recipient domain has been exceeded.
    #   https://support.google.com/a/answer/7282433
    ['452', '4.5.3', 'domain policy size per transaction exceeded'],

    # - 454 4.7.0 Cannot authenticate due to a temporary system problem. Try again later.
    #   For more information, go to About SMTP error messages.
    #   https://support.google.com/a/answer/3221692
    ['454', '4.7.0', 'cannot authenticate due to temporary system problem'],
  ],
  'userunknown' => [
    # - 550 5.1.1 The email account that you tried to reach does not exist. Please try dou-
    #   ble-checking the recipient's email address for typos or unnecessary spaces.
    #   For more information, visit https://support.google.com/mail/answer/6596
    # - https://support.google.com/mail/?p=NoSuchUser
    ['550', '5.1.1', 'the email account that you tried to reach does not exist'],

    # - 553 5.1.2 We weren't able to find the recipient domain. Please check for any spell-
    #   ing errors, and make sure you didn't enter any spaces, periods, or other punctua-
    #   tion after the recipient's email address.
    # - https://support.google.com/mail/?p=BadRcptDomain
    ['553', '5.1.2', "we weren't able to find the recipient domain"],

    # - 553 5.1.3 The recipient address <address> is not a valid RFC 5321 address. For more
    #   information, go to About SMTP error messages and review RFC 5321 specifications.
    # - https://support.google.com/a/answer/3221692
    ['553', '5.1.3', 'is not a valid rfc 5321 address'],
  ],
}.freeze

Class Method Summary

• .find(argvs) ⇒ String

  Detect bounce reason from Google Workspace.

Class Method Details

.find(argvs) ⇒ String

Detect bounce reason from Google Workspace

Parameters:

• argvs (Sisimai::Fact) —

  Decoded email object

Returns:

• (String) —

  The bounce reason for Google Workspace

See Also:

• https://support.google.com/a/answer/3726730?hl=en

# File 'lib/sisimai/rhost/google.rb', line 527

def find(argvs)
  return "" if argvs["diagnosticcode"].empty?
  return '' if Sisimai::SMTP::Reply.test(argvs['replycode']) == false
  return '' if Sisimai::SMTP::Status.test(argvs['deliverystatus']) == false

  statuscode = argvs['deliverystatus'][2,6]
  esmtpreply = argvs['replycode'][1,2]
  issuedcode = argvs['diagnosticcode'].downcase
  reasontext = ''

  MessagesOf.each_key do |e|
    # Each key is a reason name
    MessagesOf[e].each do |f|
      # Try to match an SMTP reply code, a D.S.N, and an error message
      next if issuedcode.include?(f[2])  == false
      next if f[0].end_with?(esmtpreply) == false
      next if f[1].end_with?(statuscode) == false
      reasontext = e
      break
    end
    break if reasontext.empty? == false
  end

  return reasontext
end