diff --git a/postfix/conf/master.cf b/postfix/conf/master.cf
index 8658c155..565d1a62 100644
--- a/postfix/conf/master.cf
+++ b/postfix/conf/master.cf
@@ -3,7 +3,7 @@
 
 # Exposed SMTP services
 smtp      inet  n       -       n       -       -       smtpd
-  -o smtpd_sender_restrictions=permit_mynetworks,reject_non_fqdn_helo_hostname,reject_invalid_helo_hostname,permit
+  -o smtpd_sender_restrictions=permit_mynetworks,permit
 submission inet n       -       n       -       -       smtpd
   -o smtpd_tls_security_level=encrypt
   -o smtpd_sasl_auth_enable=yes