Module: Sisimai::Rhost::NTTDOCOMO

Defined in:
lib/sisimai/rhost/nttdocomo.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 “mfsmax.docomo.ne.jp”. This class is called only Sisimai::Fact class.

Constant Summary collapse

MessagesOf = 
{
  'mailboxfull' => ['552 too much mail data'],
  'ratelimited' => ['552 too many recipients'],
  'syntaxerror' => ['503 bad sequence of commands', '504 command parameter not implemented'],
  'userunknown' => ['550 unknown user'],
}.freeze

Class Method Summary collapse

Class Method Details

.find(argvs) ⇒ String

Detect bounce reason from NTT DOCOMO

Parameters:

Returns:

  • (String) —

    The bounce reason for docomo.ne.jp



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# File 'lib/sisimai/rhost/nttdocomo.rb', line 18

def find(argvs)
  return argvs['reason'] if argvs['reason'].empty? == false
  statuscode = argvs['deliverystatus']          || ''
  thecommand = argvs['command']                 || ''
  esmtperror = argvs['diagnosticcode'].downcase || ''

  # Check the value of Status: field, an SMTP Reply Code, and the SMTP Command
  #
  #    ----- Transcript of session follows -----
  # ... while talking to mfsmax.docomo.ne.jp.:
  # >>> RCPT To:<***@docomo.ne.jp>
  # <<< 550 Unknown user ***@docomo.ne.jp
  # 550 5.1.1 <***@docomo.ne.jp>... User unknown
  # >>> DATA
  # <<< 503 Bad sequence of commands
  # ---------------------------------------------------------------------------------------
  #    ----- The following addresses had permanent fatal errors -----
  # <***@docomo.ne.jp>
  # (reason: 550 Unknown user ***@docomo.ne.jp)
  # 
  #    ----- Transcript of session follows -----
  # ... while talking to mfsmax.docomo.ne.jp.:
  # >>> DATA
  # <<< 550 Unknown user ***@docomo.ne.jp
  # 554 5.0.0 Service unavailable
  # ...
  # Final-Recipient: RFC822; ***@docomo.ne.jp
  # Action: failed
  # Status: 5.2.0
  return 'userunknown' if statuscode == '5.1.1' || statuscode == '5.9.213'
  return 'filtered'    if statuscode == '5.2.0'

  MessagesOf.each_key do |e|
    # The value of "Diagnostic-Code:" field is not empty
    # - The key name is a bounce reason name
    # - https://github.com/sisimai/go-sisimai/issues/64
    # - After March 12, 2025, if an error message contains "550 Unknown user", the
    #   bounce reason will be definitively "userunknown". This is because NTT DOCOMO
    #   no longer rejects emails via SMTP for domain-specific rejection or specified
    #   reception filters.
    return e if MessagesOf[e].any? { |a| esmtperror.include?(a) }
  end

  # A bounce reason did not decide from a status code, an error message.
  if statuscode == '5.0.0'
    # Your message to the following recipients cannot be delivered:
    #
    # <***@docomo.ne.jp>:
    # mfsmax.docomo.ne.jp [203.138.181.112]:
    # >>> RCPT TO:<***@docomo.ne.jp>
    # <<< 550 Unknown user ***@docomo.ne.jp
    # ...
    #
    # Final-Recipient: rfc822; ***@docomo.ne.jp
    # Action: failed
    # Status: 5.0.0
    # Remote-MTA: dns; mfsmax.docomo.ne.jp [203.138.181.112]
    # Diagnostic-Code: smtp; 550 Unknown user ***@docomo.ne.jp
    # -------------------------------------------------------------------------------------
    # <***@docomo.ne.jp>: host mfsmax.docomo.ne.jp[203.138.181.240] said:
    # 550 Unknown user ***@docomo.ne.jp (in reply to end of DATA
    # command)
    # ...
    # Final-Recipient: rfc822; ***@docomo.ne.jp
    # Original-Recipient: rfc822;***@docomo.ne.jp
    # Action: failed
    # Status: 5.0.0
    # Remote-MTA: dns; mfsmax.docomo.ne.jp
    # Diagnostic-Code: smtp; 550 Unknown user ***@docomo.ne.jp
    return 'userunknown' if thecommand == 'RCPT'
    return 'rejected'    if thecommand == 'DATA'
  end

  # 1. Rejected by other SMTP commands: AUTH, MAIL,
  # 2. Status: field is neither 5.0.0 nor values defined in code above
  #   もしもこのブロックを通過するNTTドコモからのエラーメッセージを見つけたら
  #   https://github.com/sisimai/rb-sisimai/issues からご連絡ねがいます。
  #
  #   If you found a error message from mfsmax.docomo.ne.jp which passes this block,
  #   please open an issue at https://github.com/sisimai/rb-sisimai/issues .
  return ""
end