1 files changed, 4 insertions, 1 deletions
diff --git a/lib/PublicInbox/Filter.pm b/lib/PublicInbox/Filter.pm
index 6cccd930..a83ecc83 100644
--- a/lib/PublicInbox/Filter.pm
+++ b/lib/PublicInbox/Filter.pm
@@ -26,7 +26,10 @@ sub run {
          # kill potentially bad/confusing headers
          # Note: ssoma already does this, but since we mangle the message,
          # we should do this before it gets to ssoma.
-        foreach my $d (qw(status lines content-length)) {
+        # We also kill Mail-{Followup,Reply}-To and Reply-To headers due to
+        # the nature of public-inbox having no real subscribers.
+        foreach my $d (qw(status lines content-length
+                        mail-followup-to mail-reply-to reply-to)) {
                  $simple->header_set($d);
          }