[Bug 3816] New: Add an X-header to know when added a Subject header

[bu...@bugzilla.spamassassin.org]

http://bugzilla.spamassassin.org/show_bug.cgi?id=3816

           Summary: Add an X-header to know when added a Subject header
           Product: Spamassassin
           Version: SVN Trunk (Latest Devel Version)
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: spamassassin
        AssignedTo: dev@spamassassin.apache.org
        ReportedBy: lwilton@earthlink.net


This comes from thinking about bug 3605.

The objection to adding a Subject header when none exists seems to be that 
there is no way to tell that the header did not previously exist; thus there is 
no way to safely strip the added Subject header back out when recreating the 
pristine mail.

The obvious solution would seem to be to know when the header was added when it 
did not previously exist.

I can see two potential fairly trivial and completely reversable ways to do 
this.

1. Add an X-Spam-Added-Subject-Header: Yes

2. Since there was no Subject header, there was no subject header text.  Create 
a Subject header that includes unique text such as "Subject Header added by 
SpamAssassin", in addition to whatever the 'rewrite' rules require for the 
Subject header.

With either method, SA can now reasonably unequivocably determine that it added 
a subject header where none had previously existed, and remove it when 
rebuilding the pristene message.

(For the objection that either of these headers can be faked in the original 
mail, and the result would then not be identical to the original mail, I submit 
that X-Spam-Status and the like get stripped from the original mail anyway, and 
can not be put back when rebuilding the pristine mail.  Thus, even now it is 
impossible to accurately rebuild the original message if it contains certian SA-
generated text/headers.  This would be in no way different.)



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