diff --git a/data/conf/postfix/main.cf b/data/conf/postfix/main.cf
index f7238631..98e81a34 100644
--- a/data/conf/postfix/main.cf
+++ b/data/conf/postfix/main.cf
@@ -149,7 +149,7 @@ smtpd_tls_protocols = !SSLv2, !SSLv3
 
 smtpd_tls_security_level = may
 tls_preempt_cipherlist = yes
-tls_ssl_options = NO_COMPRESSION
+tls_ssl_options = NO_COMPRESSION, NO_RENEGOTIATION
 virtual_alias_maps = proxy:mysql:/opt/postfix/conf/sql/mysql_virtual_alias_maps.cf,
   proxy:mysql:/opt/postfix/conf/sql/mysql_virtual_resource_maps.cf,
   proxy:mysql:/opt/postfix/conf/sql/mysql_virtual_spamalias_maps.cf,