[Mimedefang] Minor tweak to the baseline mimedefang-filter

[Philip Prindeville]

I'm looking at the code:

    if (filter_bad_filename($entity)) {
        md_graphdefang_log('bad_filename', $fname, $type);
       return action_drop_with_warning("An attachment named $fname was
removed from this document as it\nconstituted a security hazard.  If you
require this document, please contact\nthe sender and arrange an
alternate means of receiving it.\n");
    }

Can we make this:

$SilentlyDiscardSuspectAttachments = 1;
...

    if (filter_bad_filename($entity)) {
        md_graphdefang_log('bad_filename', $fname, $type);
        if ($SilentlyDropSuspectAttachments) {
           return action_drop_with_warning("An attachment named $fname
was removed from this document as it\nconstituted a security hazard.  If
you require this document, please contact\nthe sender and arrange an
alternate means of receiving it.\n");
        } else {
            return action_bounce("Message rejected; an attachment named
$fname of\ndubious nature was found in this message.\nContact the
postmaster if this was a legitimate transfer.\n");
        }
    }


Instead?  This will make a common policy change easier for people to
implement as a configuration issue rather than as code modification.

Thanks,

-Philip