diff --git a/howto/enable.dnsbl.md b/howto/enable.dnsbl.md
index 9d2b4097..55608cdc 100644
--- a/howto/enable.dnsbl.md
+++ b/howto/enable.dnsbl.md
@@ -20,7 +20,7 @@ specified order.
 
 ## References
 
-* [Postfix Configuration Parameters: reject_rbl_client](http://www.iredmail.org/postconf.5.html#reject_rbl_client)
+* [Postfix Configuration Parameters: reject_rbl_client](http://www.postfix.org/postconf.5.html#reject_rbl_client)
 * [Spamhaus website](http://www.spamhaus.org)
 
     * [Spamhaus DNSBL Usage Terms](https://www.spamhaus.org/organization/dnsblusage/)
diff --git a/html/enable.dnsbl.html b/html/enable.dnsbl.html
index a57b888d..98eb5f42 100644
--- a/html/enable.dnsbl.html
+++ b/html/enable.dnsbl.html
@@ -30,7 +30,7 @@ specified order.</p>
 </ul>
 <h2 id="references">References</h2>
 <ul>
-<li><a href="http://www.iredmail.org/postconf.5.html#reject_rbl_client">Postfix Configuration Parameters: reject_rbl_client</a></li>
+<li><a href="http://www.postfix.org/postconf.5.html#reject_rbl_client">Postfix Configuration Parameters: reject_rbl_client</a></li>
 <li>
 <p><a href="http://www.spamhaus.org">Spamhaus website</a></p>
 <ul>