- Upgrade packages during build (#1450)
- Fix errors in logrotate (#1451, #1467, #1514)
- Mailbox quotas (#1469, #1479, #1482)
- Comments in config files (#1494)
- Accept SPAM messages to inbox and move to junk (#1485, #1488, #1491)
- Improved letsencrypt support (#1509)
- Misc cleanup and security fixes (#1458, #1462, #1463, #1473, #1474, #1481, #1483, #1495, #1505, #1506)