Updated dovecot configuration

install/deb/dovecot/conf.d/10-ssl.conf

@@ -5,4 +5,9 @@ ssl_cipher_list = ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDH
 
 ssl_cert = </usr/local/hestia/ssl/certificate.crt
 ssl_key = </usr/local/hestia/ssl/certificate.key
-ssl_dh = </etc/ssl/dhparam.pem
+
+# From and up to version 2.2
+ssl_dh_parameters_length = 2048
+
+# From version 2.3
+#ssl_dh = </etc/ssl/dhparam.pem