http://bugzilla.spamassassin.org/show_bug.cgi?id=3417

           Summary: New Rule: Checking sender IP against MX records From:
                    [EMAIL PROTECTED]
           Product: Spamassassin
           Version: unspecified
          Platform: All
               URL: ftp://ftp.rfc-editor.org/in-notes/internet-drafts/draft-
                    stout-antispam-00.txt
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Rules (Eval Tests)
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


According 
ftp://ftp.rfc-editor.org/in-notes/internet-drafts/draft-stout-antispam-00.txt
it is recomended to Register all sender MTAs within DNS as MX records with 
special priority (65535)

After this MTA should check sender IP address against the obtained via DNS list
of valid mail servers.

It possible to create the new rule for Spamassassin that perform this checking?



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