Sisimai::Reason::SyntaxError - Bounce reason is "syntaxerror" or not.

       azumakuniyuki

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

           print Sisimai::Reason::SyntaxError->text;  # syntaxerror

   "match(string)"
       match() method always return "undef"

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

       Copyright (C) 2015-2016,2018,2020,2021,2024 azumakuniyuki, All rights reserved.

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

       This is the error that the destination mail server could not recognize the SMTP command which is sent
       from the sender's MTA. Sisimai will set "syntaxerror" to the reason if the value of "replycode" begins
       with 50 such as 502, or 503.

           Action: failed
           Status: 5.5.0
           Diagnostic-Code: SMTP; 503 Improper sequence of commands

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

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

       Sisimai::Reason::SyntaxError - Bounce reason is "syntaxerror" or not.

           use Sisimai::Reason::SyntaxError;
           print Sisimai::Reason::SyntaxError->text;   # syntaxerror