diff --git a/etc/alternc/templates/alternc/postfix/postfix.cf b/etc/alternc/templates/alternc/postfix/postfix.cf
index 2e246818..fd571199 100644
--- a/etc/alternc/templates/alternc/postfix/postfix.cf
+++ b/etc/alternc/templates/alternc/postfix/postfix.cf
@@ -61,6 +61,7 @@ smtp_tls_CAfile = $smtpd_tls_CAfile
 smtp_tls_key_file = $smtpd_tls_dcert_file
 smtp_tls_cert_file = $smtpd_tls_dcert_file
 smtp_use_tls = yes
+smtp_tls_security_level = may
 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
 smtpd_tls_protocols = TLSv1, TLSv1.1, TLSv1.2
 smtp_tls_protocols = TLSv1, TLSv1.1, TLSv1.2