diff --git a/content/blog/mail_server_alpine_postfix_dovecot_tutorial/index.md b/content/blog/mail_server_alpine_postfix_dovecot_tutorial/index.md
index f65c3a4..3d9ace2 100644
--- a/content/blog/mail_server_alpine_postfix_dovecot_tutorial/index.md
+++ b/content/blog/mail_server_alpine_postfix_dovecot_tutorial/index.md
@@ -424,7 +424,6 @@ smtpd_delay_reject = yes
 smtpd_helo_restrictions =
     permit_mynetworks,
     reject_invalid_helo_hostname,
-    reject_unknown_helo_hostname,
     permit
 ```