lib/PublicInbox/MDA.pm | 8 --------

diff --git a/lib/PublicInbox/MDA.pm b/lib/PublicInbox/MDA.pm
index 8c2d6ed25e2301959961b9b758463e0de9fbcab7..25d6ae556eb7bfc09f33c03e695630bb7c7b08cb 100644
--- a/lib/PublicInbox/MDA.pm
+++ b/lib/PublicInbox/MDA.pm
@@ -70,14 +70,6 @@ 			urgent return-receipt-to disposition-notification-to
 			x-confirm-reading-to x-pmrqc)) {
 		$simple->header_set($h);
 	}
-
-	# Remove any "DomainKeys" (or similar) header lines.
-	# Any modifications (including List-Id) will cause a message
-	# to appear invalid
-	foreach my $h (qw(domainkey-signature dkim-signature
-			authentication-results)) {
-		$simple->header_set($h);
-	}
 }
 
 # returns a 3-element array: name, email, date