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-rw-r--r--lib/PublicInbox/MDA.pm3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/PublicInbox/MDA.pm b/lib/PublicInbox/MDA.pm
index e2b2f914..d2ce79eb 100644
--- a/lib/PublicInbox/MDA.pm
+++ b/lib/PublicInbox/MDA.pm
@@ -65,6 +65,9 @@ sub set_list_headers {
         $simple->header_set("List-Id", $pa);
         $simple->header_set("List-Post", $pa);
 
+        # prevent training loops
+        $simple->header_set('Delivered-To');
+
         my $url = $dst->{url};
         if (defined $url) {
                 $simple->header_set("List-Archive", "<$url>");