diff --git a/install/tpl/postfix_2-5.conf.master b/install/tpl/postfix_2-5.conf.master
index 132c80822e488b6b123e88002f1092e7dbd5b633..8f96430e52ecc0df28b280f6a826a0fe4b3e1a1a 100644
--- a/install/tpl/postfix_2-5.conf.master
+++ b/install/tpl/postfix_2-5.conf.master
@@ -11,3 +11,4 @@
 #{stress_adaptive} smtpd_soft_error_limit = ${stress?2}${stress:5}
 #{stress_adaptive} smtpd_timeout = ${stress?10}${stress:60}s
 
+smtpd_forbidden_commands = CONNECT,GET,POST,USER,PASS