hMailServer

hmailserver.com · checked 12 Oct 2026

#14 · Email Server Software #16 · Mail Server Software

Visit hmailserver.com ↗ Alternatives hMailServer vs Pegasus Mail

How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Email Server Software6.0#14 of 33

hMailServer is a self-hosted mail server that supports SMTP, IMAP and POP3.

Pricing

hMailServerFree and open source under AGPL-3.0 · no per-mailbox fees · no paid tiersFree

As hmailserver.co.uk lists them, checked 12 Oct 2026.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: hmailserver.com
Price: Free tier
Free trial: No
Databases: Windows supports SQL Server Compact, MySQL or MariaDB, Microsoft SQL Server and PostgreSQL; Linux supports PostgreSQL and MySQL or MariaDB.
Directories and calendars: It serves account address books over CardDAV and calendars over CalDAV when the web services HTTPS listener is enabled.
Download verification: The FAQ says release files have Sigstore bundles, Linux SHA-256 checksums and Windows Authenticode signature verification instructions.
Email authentication: It supports SPF, DKIM, DMARC, MTA-STS, DANE, ARC sealing and TLS reporting.
Intended users: The documentation suggests hMailServer for small businesses, developers needing an SMTP and IMAP test endpoint, and hosting providers.
Linux limitations: Linux has no Control Panel, COM API or Microsoft SQL Server support, and moving an existing Windows installation to Linux is not a supported migration.
Mail protocols: It serves mail to clients such as Outlook, Thunderbird and Apple Mail, or through its built-in webmail.
Not an Exchange replacement: The FAQ says hMailServer has no Teams integration or ActiveSync and is not a replacement for Microsoft Exchange.
REST API: The REST API is available on Windows and Linux but is off by default; it requires a TLS certificate and key to bind beyond loopback.
Security updates: The FAQ says release 6.3.6 fixes security flaws found in earlier versions and that the 6.3 line receives security fixes until 30 September 2027.
Spam and virus filtering: It provides spam filtering, virus scanning through ClamAV, a rules engine and Sieve filtering.
Support: Free help is available on the community forum, where answers are not gated behind a support plan.

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