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Stalwart Mail Server

stalwart.email

From $0.09/mo Free plan WebWindowsmacOSLinuxAPISelf-hosted
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Spec score 8.0 #12 of 33 in Email Server Software

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 Free Free under AGPL-3.0 AGPL-3.0 licensed · Self-hosted deployment · Standard mail and collaboration protocols Read 21 Sep 2026 · stalwart.email
Enterprise: 25–499 mailboxes $2.40 a year Annual rate; tiered pricing 25–499 mailboxes Read 21 Sep 2026 · stalwart.email
Enterprise: 500–999 mailboxes $2.04 a year Annual rate; tiered pricing 500–999 mailboxes Read 21 Sep 2026 · stalwart.email
Enterprise: 1,000–4,999 mailboxes $1.74 a year Annual rate; tiered pricing 1,000–4,999 mailboxes Read 21 Sep 2026 · stalwart.email
Enterprise: 5,000–10,000 mailboxes $1.48 a year Annual rate; tiered pricing 5,000–10,000 mailboxes Read 21 Sep 2026 · stalwart.email
Enterprise: 10,000–49,999 mailboxes $1.25 a year Annual rate; tiered pricing 10,000–49,999 mailboxes Read 21 Sep 2026 · stalwart.email
Enterprise: 50,000–99,999 mailboxes $1.09 a year Annual rate; tiered pricing 50,000–99,999 mailboxes Read 21 Sep 2026 · stalwart.email
Enterprise: 100,000+ mailboxes Priced on request 100,000+ mailboxes Read 21 Sep 2026 · stalwart.email
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

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