Stalwart Mail Server
stalwart.email
Spec sheet
- Product
- Stalwart is an open-source mail and collaboration server for email, calendars, contacts, and shared files.Read 30 Sep 2026 · stalwart.email
- Deployment
- Stalwart can run as one node or as a cluster across regions, and its site describes it as designed to scale to millions of mailboxes.Read 30 Sep 2026 · stalwart.email
- Integrations
- Listed integrations include LDAP, Active Directory, OIDC, SQL directories, RocksDB, FoundationDB, PostgreSQL, MySQL, SQLite, S3-compatible storage, Azure Blob, and search engines including Meilisearch, Elasticsearch, and OpenSearch.Read 30 Sep 2026 · stalwart.email
- Security
- The product page lists mailbox encryption at rest with S/MIME or OpenPGP, DANE, MTA-STS, automatic ACME TLS, DKIM key rotation, access controls, rate limiting, and automatic IP banning.Read 30 Sep 2026 · stalwart.email
- Headquarters
- London, United KingdomRead 23 Sep 2026 · stalwart.email
- Admin
- The browser-based admin console includes dashboards, live tracing, account and domain management, queue and report visualization, and server configuration.Read 30 Sep 2026 · stalwart.email
- Audit
- A published report says Radically Open Security conducted a penetration test of Stalwart v0.13.2 in September 2025 and found two high-severity and five low-severity issues.Read 30 Sep 2026 · stalwart.email
- Community edition
- The Community Edition is free under AGPL-3.0 and offers community support through a support portal and community channels.Read 30 Sep 2026 · stalwart.email
- DNS and observability
- Stalwart lists automated DNS integrations for providers including Cloudflare, AWS Route 53, Google Cloud DNS, and Azure DNS, plus OpenTelemetry export and a Prometheus endpoint.Read 30 Sep 2026 · stalwart.email
- Enterprise pricing limits
- Only user and group mailboxes count toward Enterprise pricing; mailing lists and aliases are not billed, and each tier is billed at its own rate.Read 30 Sep 2026 · stalwart.email
- Enterprise trial
- The pricing page offers a 30-day Enterprise trial with full access to Enterprise features for evaluation.Read 30 Sep 2026 · stalwart.email
- Premium support
- Enterprise subscriptions of 150 mailboxes or more include Premium Support with priority response, expedited bug fixing, and product-roadmap influence.Read 30 Sep 2026 · stalwart.email
- Protocols
- It supports JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV, and WebDAV.Read 30 Sep 2026 · stalwart.email
- Spam protection
- Built-in spam and phishing protection includes a statistical filter, blocklists, sender reputation, and AI-driven analysis.Read 30 Sep 2026 · stalwart.email
Plans and prices
Community Edition Free Free under AGPL-3.0 Community Edition Read 30 Sep 2026 · stalwart.email
Enterprise — 50,000 to 99,999 mailboxes $1.09 a year USD 1.09 per mailbox per year 50,000 to 99,999 mailboxes Read 30 Sep 2026 · stalwart.email
Enterprise — 10,000 to 49,999 mailboxes $1.25 a year USD 1.25 per mailbox per year 10,000 to 49,999 mailboxes Read 30 Sep 2026 · stalwart.email
Enterprise — 5,000 to 10,000 mailboxes $1.48 a year USD 1.48 per mailbox per year 5,000 to 10,000 mailboxes Read 30 Sep 2026 · stalwart.email
Enterprise — 1,000 to 4,999 mailboxes $1.74 a year USD 1.74 per mailbox per year 1,000 to 4,999 mailboxes Read 30 Sep 2026 · stalwart.email
Enterprise — 500 to 999 mailboxes $2.04 a year USD 2.04 per mailbox per year 500 to 999 mailboxes Read 30 Sep 2026 · stalwart.email
Enterprise — 25 to 499 mailboxes $2.40 a year USD 2.40 per mailbox per year 25 to 499 mailboxes Read 30 Sep 2026 · stalwart.email
Enterprise — 100,000 mailboxes and beyond Priced on request Obtain quote 100,000 mailboxes and beyond Read 30 Sep 2026 · stalwart.email
Where Specifiction places it
- Mail Server Software#15 of 348.0
