Stalwart is an all-in-one mail and collaboration server that combines mail transfer, mailbox access, calendars, contacts and file-related services within a single platform.
It supports both established protocols such as SMTP, IMAP and POP3 and newer interfaces including JMAP. CalDAV, CardDAV and WebDAV support extend the server beyond email into calendars, contacts and collaborative data.
Administration is available through a web interface and the server includes filtering, authentication, storage and security functionality that would often require several separate components in a conventional mail stack.
This is free and open source software.
Key Features
- SMTP mail transfer and submission.
- IMAP and POP3 mailbox access.
- JMAP support.
- CalDAV calendars and CardDAV contacts.
- WebDAV support.
- Sieve message filtering.
- Built-in spam filtering.
- DKIM, SPF and DMARC-related mail-security functionality.
- Flexible authentication and directory integration.
- Multiple storage backends.
- TLS and automated certificate management.
- Web-based administration.
- Multi-domain and multi-tenant operation.
- Clustering and distributed deployments.
- Metrics, tracing and other observability facilities.
Website: github.com/stalwartlabs/stalwart
Support:
Developer: Stalwart Labs LLC
License: GNU Affero General Public License v3.0 / Stalwart Enterprise License v2.0
Stalwart is written in Rust. Learn Rust with our recommended free books and free tutorials.
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