- Remove port 143 from mailserver (only expose 993/IMAPS)
- Enable SSL_TYPE=manual with Let's Encrypt certs
- Set DOVECOT_DISABLE_PLAINTEXT_AUTH=yes
- Add pentest_imap_tls config field (defaults to true)
Fixes CERT-Bund report: IMAP PLAIN/LOGIN without TLS on 46.225.100.82:143
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>