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-rw-r--r--lib/PublicInbox.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox.pm b/lib/PublicInbox.pm
index a4aba346..b05fd8c5 100644
--- a/lib/PublicInbox.pm
+++ b/lib/PublicInbox.pm
@@ -19,6 +19,7 @@ sub precheck {
         my $simple = $filter->simple;
         return 0 unless $simple->header("Message-ID");
         return 0 unless defined($filter->from);
+        return 0 unless $simple->header("Subject");
         return 0 if length($simple->as_string) > MAX_SIZE;
         recipient_specified($filter, $recipient);
 }