tls_certificate = /etc/exim4/ssl/exim.cert tls_privatekey = /etc/exim4/ssl/exim.key tls_advertise_hosts = * tls_require_ciphers = ECHACHA20+POLY1305:ECDH+AESGCM:EDH+AESGCM openssl_options = +no_sslv2 +no_sslv3