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-rw-r--r--lib/PublicInbox/Config.pm3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/PublicInbox/Config.pm b/lib/PublicInbox/Config.pm
index abc525db..d57c361a 100644
--- a/lib/PublicInbox/Config.pm
+++ b/lib/PublicInbox/Config.pm
@@ -424,8 +424,9 @@ EOF
                 $self->{-no_obfuscate}->{$lc_addr} = 1;
         }
         if (my $listids = $ibx->{listid}) {
+                # RFC2919 section 6 stipulates "case insensitive equality"
                 foreach my $list_id (@$listids) {
-                        $self->{-by_list_id}->{$list_id} = $ibx;
+                        $self->{-by_list_id}->{lc($list_id)} = $ibx;
                 }
         }
         if (my $ng = $ibx->{newsgroup}) {