diff --git a/service/dovecot/container/config/dovecot.conf.template b/service/dovecot/container/config/dovecot.conf.template
index 7898f2c..62b8665 100644
--- a/service/dovecot/container/config/dovecot.conf.template
+++ b/service/dovecot/container/config/dovecot.conf.template
@@ -80,7 +80,7 @@ protocols = imap
 ssl = yes
 ssl_min_protocol = TLSv1.2
 ssl_cipher_list = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
-ssl_prefer_server_ciphers = yes
+ssl_prefer_server_ciphers = no
 
 ssl_cert = </etc/ssl/private/certificates/${DOVECOT_HOST}.crt
 ssl_key = </etc/ssl/private/certificates/${DOVECOT_HOST}.key
diff --git a/service/postfix/container/config/main.cf.template b/service/postfix/container/config/main.cf.template
index 50e050d..9378253 100644
--- a/service/postfix/container/config/main.cf.template
+++ b/service/postfix/container/config/main.cf.template
@@ -199,7 +199,7 @@ smtpd_tls_loglevel = 1
 # Other TLS configuration parameters.
 tls_random_source = dev:/dev/urandom
 tls_ssl_options = no_ticket, no_compression
-tls_preempt_cipherlist = yes
+tls_preempt_cipherlist = no
 
 # Certificate file location.
 smtpd_tls_cert_file = /etc/ssl/private/certificates/${POSTFIX_HOST}.crt