# mismatch on identical Message-ID
$mime->header_set('Message-ID', '<a@example.com>');
($mark, $msg) = $im->remove($mime);
-is($mark, -1, 'mark == -1 on mismatch');
+is($mark, 'MISMATCH', 'mark == MISMATCH on mismatch');
is($msg->header('Message-ID'), '<a@example.com>', 'Message-ID matches');
isnt($msg->header('Subject'), $mime->header('Subject'), 'subject mismatch');