[exim-dev] [Bug 520] New: improve SPF informational message

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http://www.exim.org/bugzilla/show_bug.cgi?id=520

           Summary: improve SPF informational message
           Product: Exim
           Version: 4.67
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Keywords: work:tiny
          Severity: bug
          Priority: medium
         Component: Documentation
        AssignedTo: ph10@???
        ReportedBy: rmh@???
         QAContact: exim-dev@???

The sample SPF informational message from doc/experimental-spec.txt is not
completely correct. Usually $sender_address_domain applies, but when
$sender_address is null, SPF ressorts to $sender_helo_name for verification.

If the latter is used and test fails, we get to reply something like:

"1.2.3.4 is not allowed to send mail from "

Attached patch adds the necessary checks so that message ends with
$sender_helo_name when this happens.

While I was at it, I also improved the message a bit with a link to the
dynamical http://www.openspf.org/Why page with appropiate parameters.

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