# Postfix Upgrade Checklist

- [ ] Record package and Postfix versions
- [ ] Back up /etc/postfix and maps
- [ ] Save postconf -n and postconf -M
- [ ] Review release notes
- [ ] Run postfix check after upgrade
- [ ] Test SMTP, TLS, SASL, DKIM and delivery
- [ ] Monitor queue and logs
- [ ] Keep rollback plan ready