Mail server · Vendor site 2026-10-04
Stalwart is an all-in-one mail and collaboration server written in Rust with JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV, and WebDAV in a single platform. It bundles anti-spam filtering, clustering, encryption, and enterprise licensing while offering a free community edition for self-hosters.
Organizations replacing multi-component mail stacks with one Rust-native server for email, calendars, contacts, and files.
Enterprise pricing is quoted per mailbox per year in USD tiers starting at 25 mailboxes, so small teams must use the community build or meet minimum license counts.
Stalwart collapses MTA, mailbox, calendar, and file services into one Rust server with modern JMAP support and enterprise anti-abuse tooling.
What it can do
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| All-in-one stack | Homepage markets one server for mail, calendars, contacts, and shared files with JMAP, IMAP, POP3, SMTP, and DAV protocols. | Facts sourced | 2026-10-04 |
| Anti-spam | Feature copy describes built-in spam and phishing filters with statistical classifiers and blocklists. | Facts sourced | 2026-10-04 |
| Enterprise licensing | Pricing page lists tiered USD per-mailbox annual rates beginning at $2.40 for 25–499 mailboxes with monthly billing cycles available. | Facts sourced | 2026-10-04 |
Understand the total cost
Free
Free
Community edition is available for self-hosting; enterprise licensing uses per-mailbox subscriptions with a 30-day trial.
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Stalwart is an all-in-one mail and collaboration server written in Rust with JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV, and WebDAV in a single platform. It bundles anti-spam filtering, clustering, encryption, and enterprise licensing while offering a free community edition for self-hosters.
Community edition is available for self-hosting; enterprise licensing uses per-mailbox subscriptions with a 30-day trial.. This record lists ongoing free access; check the plan limits before starting.
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Not confirmed. API access and subscription access may have different terms; consult the linked sources.
Enterprise pricing is quoted per mailbox per year in USD tiers starting at 25 mailboxes, so small teams must use the community build or meet minimum license counts.
No retained pricing changes yet. A current price alone does not establish a historical trend.
Reviewed vendor source
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