diff --git a/data/conf/postfix/main.cf b/data/conf/postfix/main.cf
index dc49e75e..9ce7dcde 100644
--- a/data/conf/postfix/main.cf
+++ b/data/conf/postfix/main.cf
@@ -88,7 +88,7 @@ smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch, permit_m
 smtpd_soft_error_limit = 3
 smtpd_tls_auth_only = yes
 smtpd_tls_dh1024_param_file = /etc/ssl/mail/dhparams.pem
-smtpd_tls_eecdh_grade = auto
+smtpd_tls_eecdh_grade = strong
 smtpd_tls_exclude_ciphers = ECDHE-RSA-RC4-SHA, RC4, aNULL, DES-CBC3-SHA, ECDHE-RSA-DES-CBC3-SHA, EDH-RSA-DES-CBC3-SHA
 smtpd_tls_loglevel = 1
 smtp_tls_mandatory_protocols = !SSLv2, !SSLv3