On February the 12th 2020 we disabled the deprecated protocols TLS 1.0 and 1.1 in Dovecot (POP3, POP3S, IMAP, IMAPS) and Postfix (SMTPS, SUBMISSION).
Unauthenticated mail via SMTP on port 25/tcp does still accept >= TLS 1.0 . It is better to accept a weak encryption than none at all.
How to re-enable weak protocols?
Edit data/conf/postfix/extra.cf:
submission_smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtps_smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
Edit data/conf/dovecot/extra.conf:
ssl_min_protocol = TLSv1
Restart the affected services:
docker compose restart postfix-mailcow dovecot-mailcow
docker-compose restart postfix-mailcow dovecot-mailcow
Hint: You can enable TLS 1.2 in Windows 7.
Last update:
2023-01-13 18:16:08