diff --git a/etc/mail/sendmail.cf.additions b/etc/mail/sendmail.cf.additions
index 7094540bd25..0921b96cc21 100644
--- a/etc/mail/sendmail.cf.additions
+++ b/etc/mail/sendmail.cf.additions
@@ -63,24 +63,24 @@ R$*			$: $>3 $1
 # remove all RFC-822 comments--END
 # mail must come from a DNS resolvable host--BEGIN
 R$* < @ $+ . >		$: $1 @ $2
-R$* < @ $+ >		$#error $: "451 Domain does not resolve"
+R$* < @ $+ >		$#error $@ 4.1.8 $: "451 Domain does not resolve"
 # mail must come from a DNS resolvable host--END
 # mail must NOT come from a known source of spam--BEGIN
 R$+ @$+			$: <$1@$2> $2
 R<$*> $+.$+.$+		<$1> $3.$4
 R<$*> $*		$: $(spamsites $2 $: OK $)
-R$+.REJECT		$#error $: 521 $1 
+R$+.REJECT		$#error $@ 5.7.1 $: 550 $1
 R<$*> $*		$: $1
 # mail must NOT come from a known source of spam--END
 # Connecting Host must resolve--BEGIN
 R$*			$: $1 $: $(dequote "" $&{client_name} $)
 R$*			$: $>3 foo@$1
-R<$*> $*<@$*>		$#error $: "451 Domain does not resolve"
+R<$*> $*<@$*>		$#error $@ 4.1.8 $: "451 Domain does not resolve"
 # Connecting Host must resolve--END
 # ip address must NOT be in Paul Vixie's RBL--BEGIN
 R$*			$: $1 $: $(dequote "" $&{client_addr} $)
 R$*			$: $>check_rbl $1
-R$*.com.		$#error $: "550 Mail refused, see http://maps.vix.com/rbl"
+R$*.com.		$#error $@ 5.7.1 $: "550 Mail refused, see http://maps.vix.com/rbl"
 # ip address must NOT be in Paul Vixie's RBL--END
 R$*			$@ OK
 
@@ -96,7 +96,7 @@ Scheck_rcpt
 # mail must NOT be addressed "fakenames"--BEGIN
 R$*			$: <$1> $>3 $1
 R<$*> $+ < @ $+ >	$: <$1> $(fakenames $2 $: OK $)
-R$+.REJECT		$#error $: 521 $1
+R$+.REJECT		$#error $@ 5.2.1 $: 550 $1
 R<$*> $*		$: $1
 # mail must NOT be addressed "fakenames"--END
 # mail must come from or go to this machine or machines we allow to relay--BEGIN
@@ -108,7 +108,7 @@ R<$*> $*		$: $1
 # R$=w			$@ OK
 # R$* $=R			$@ OK
 # R$@			$@ OK
-# R$*			$#error $: "550 Relaying Denied"
+# R$*			$#error $@ 5.7.1 $: "550 Relaying Denied"
 # mail must come from or go to this machine or machines we allow to relay--END
 R$*			$@ OK