diff --git a/lib/smtpd.conf b/lib/smtpd.conf
index f2d44e9..8df19fb 100644
--- a/lib/smtpd.conf
+++ b/lib/smtpd.conf
@@ -8,7 +8,7 @@
 
 defaultdomain		fulton.software
 norelay			on	#allow relaying
-verifysenderdom		off	#disable dns verification of sender domain
+verifysenderdom		on
 saveblockedmsg		off	#save blocked messages
 
 #