Sisimai::Reason::Filtered - Bounce reason is "filtered" or not.

       azumakuniyuki

"text()"
       text() method returns the fixed string "filtered".

           print Sisimai::Reason::Filtered->text;  # filtered

   "match(string)"
       match() method returns 1 if the argument matched with patterns defined in this class.

           print Sisimai::Reason::Filtered->match('550 5.1.2 User reject');   # 1

   "true(Sisimai::Fact)"
       true() method returns 1 if the bounce reason is "filtered". The argument must be "Sisimai::Fact" object
       and this method is called only from Sisimai::Reason class.

       Copyright (C) 2014-2018,2020-2024 azumakuniyuki, All rights reserved.

       "Sisimai::Reason::Filtered" checks the bounce reason is "filtered" or not. This class is called only
       "Sisimai::Reason" class.

       This is the error that an email has been rejected by a header content after SMTP "DATA" command.  In
       Japanese cellular phones, the error will incur that the sender's email address or the domain is rejected
       by recipient's email configuration. Sisimai will set "filtered" to the reason of email bounce if the
       value of "Status:" field in the bounce email is 5.2.0 or 5.2.1.

       This error reason is almost the same as "UserUnknown".

           ... while talking to mfsmax.ntt.example.ne.jp.:
           >>> DATA
           <<< 550 Unknown user kijitora@ntt.example.ne.jp
           554 5.0.0 Service unavailable

       This software is distributed under The BSD 2-Clause License.

perl v5.40.1                                       2025-04-12                     Sisimai::Reason::Filtered(3pm)

       Sisimai::Reason::Filtered - Bounce reason is "filtered" or not.

           use Sisimai::Reason::Filtered;
           print Sisimai::Reason::Filtered->match('550 5.1.2 User reject');   # 1