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Stalwart Mail Server

OPEN SRC

All-in-one mail server with JMAP, IMAP4, and SMTP support and a wide range of modern features

VG SCORE
9.0
VIEW ALTERNATIVES

Product Details

PricingOpen Source
API✅ REST
Learning CurveModerate
Integrations8 available

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PROS & CONS

STRENGTHS

  • Modern JMAP support offers a compelling alternative to IMAP
  • Completely free and open-source under the AGPLv3 license.

WEAKNESSES

  • −Being relatively new, it has a smaller community and less third-party documentation than established servers like Postfix/Dovecot
  • −Being a newer project, it has a smaller community and less third-party documentation than established servers.

KEY FEATURES

Unified Management

Provides a single server for SMTP, IMAP, JMAP, and ManageSieve, simplifying administration.

Unified Protocol Support

Integrates JMAP, IMAP4, and SMTP in one server.

JMAP Modern API

Offers a fast, efficient, and sync-friendly alternative to IMAP.

JMAP & IMAP Support

Offers modern JMAP protocol alongside traditional IMAP4 for flexible email access.

WHO IS Stalwart Mail Server BEST FOR?

Developers and tech startups

They benefit from an all-in-one, customizable mail server solution that integrates easily into applications and avoids vendor lock-in with open-source flexibility.

System administrators and IT teams

They need a self-hosted, open-source mail server with modern protocols like JMAP and robust SMTP/IMAP support for full control over email infrastructure.

INTEGRATIONS

ClamAVSpamAssassinLDAP/Active DirectoryPostgreSQLS3-compatible storagePrometheusRedisMySQL

TECHNICAL DETAILS

LEARNING CURVE
MODERATE — FEW HOURS
API

✓ REST

FIELD REPORTS (0)

No field reports yet. Be the first to review Stalwart Mail Server.

DOSSIER

LAST VERIFIED MAR 23, 2026
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FILED UNDER

Developer ToolsOpen Source

ALTERNATIVES

Synapse9.0/10
ALL ALTERNATIVES

INTEGRATIONS

ClamAVSpamAssassinLDAP/Active DirectoryPostgreSQLS3-compatible storagePrometheusRedisMySQL

PRICING MODEL

open source

BEST FOR

Developers and tech startups System administrators and IT teams

FEATURES

Has API

FINAL ASSESSMENT

APPROVED — WORTH YOUR MONEY

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