drop Mail-Followup-To, Mail-Reply-To, and Reply-To

Due to the higher latency of a pull-based email, we want to
encourage the use of reply-to-all for public-inbox.

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);
         }