Modern TLS Version for dovecot & postfix

(TLS 1.2 or newer)

You can use the following settings to ensure that Dovecot and Postfix use a modern TLS version:

For Dovecot:

  1. Open the file /etc/dovecot/conf.d/10-ssl.conf (Debian).
  2. Uncomment the line starting with ssl_min_protocol and set it to ssl_min_protocol = TLSv1.2.

For Postfix:

  1. Open the file /etc/postfix/ (Debian).
  2. Add the following directive: smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1.

Finally, reload Postfix with systemctl reload postfix and restart Dovecot with systemctl restart dovecot.

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