MAJOR FEATURES
- Introduces Conversation View (AXI-1327)
- Introduces Mailbox API (AXI-3051)
- Labels with WebMail, IMAP, and Sieve support — imap4flags (AXI-3661)
- OAuth 2.0 / OpenID Connect support with multiple authentication providers (AXI-3112)
- Helm Chart for Kubernetes deployments
MINOR FEATURES
- "Starred" / "Flagged" virtual folder (AXI-3140)
- Extended Sieve filtering — provisioning templates with versioning support, on/off filters, filter presets, extlists and variables support (AXI-3334)
- Dark Mode support for WebMail
- WebMail composer features: @mentions, Emojis, enhanced HTML editor
- HAProxy Protocol Support (AXI-3041)
- Clustering Improvements: auto-join, use hostnames (AXI-3166)
- Push notifications generator (AXI-3525)
- Extended search support for Japanese (optional)
ENHANCEMENTS & PERFORMANCE IMPROVEMENTS
- Calendar improvements
- Indexing improvements
- More robust image processing with EXIF support for contact avatars and attachment thumbnails (AXI-3787)
- Support for password change with policy enforcement via CLI (AXI-4315)
- Auto-purge mails based on creation/move time (AXI-4326)
- WebAdmin SMTP filtering based on DNS TXT records (AXI-2849)
- SPF filtering results reflected in Authentication-Results header (AXI-3058)
- DKIM filtering results reflected in Authentication-Results header (AXI-3059)
- SMTP filtering enhanced support for authenticated user local part and domain (AXI-2560)
- Various other stability and performance improvements
DEPRECATED FUNCTIONALITY
- Kaspersky AntiVirus and AntiSpam
- Outlook Connector