mda: prevent duplicate Message-IDs from appearing

For practical purposes, Message-IDs are unique and duplicates
do not appear unless client software is broken.

diff --git a/public-inbox-mda b/public-inbox-mda
index aabc37ebf3c4b0a2c6ba3ed090c49c775406551b..70fbdf27faded071df827f9af0bea765dcd798f3 100755 (executable)
--- a/public-inbox-mda
+++ b/public-inbox-mda
@@ -42,7 +42,7 @@ if (PublicInbox->precheck($filter, $recipient) &&
                # run spamc again on the HTML-free message
                if (do_spamc($simple, \$filtered)) {
                        $filter->simple(Email::Simple->new($filtered));
-                       $filter->pipe(MDA, $main_repo);
+                       $filter->pipe(MDA, '-1', $main_repo);
                }
        }
 }