diff --git a/install/ubuntu/16.04/dovecot/conf.d/10-ssl.conf b/install/ubuntu/16.04/dovecot/conf.d/10-ssl.conf
index 3aaff6ee..24cbf3e2 100644
--- a/install/ubuntu/16.04/dovecot/conf.d/10-ssl.conf
+++ b/install/ubuntu/16.04/dovecot/conf.d/10-ssl.conf
@@ -1,3 +1,5 @@
 ssl = yes
+ssl_protocols = !SSLv2 !SSLv3
+
 ssl_cert = </usr/local/vesta/ssl/certificate.crt
 ssl_key = </usr/local/vesta/ssl/certificate.key