Stalwart Mail Server

OPEN SRC

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

► Modern organizations seeking a secure, scalable all-in-one mail server

VG SCORE

7.0

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Product Details

PricingOpen Source

API✅ REST

Learning CurveModerate

Integrations8 available

■ INTELLIGENCE BRIEFING — Weekly tool drops. No spam.

PROS & CONS

STRENGTHS

Modern JMAP support offers a compelling alternative to IMAP
Completely free and open-source under the AGPLv3 license.
Open source design allows for full customization and avoids vendor lock-in, which benefits technical administrators.

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.