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Screenshot of Stalwart Mail Server website

MAIL & COMMUNICATION · PRO TIER

Stalwart Mail Serverpro

Stalwart is a modern, all-in-one mail server written in Rust — SMTP + IMAP + JMAP + WebDAV in a single binary. Designed from scratch with modern protocols (JMAP), modern security, modern UX. The "what if email was designed today" answer.

Install via WHMCS → Visit stalw.art ↗

📧 Mail & Communication Min 1024 MB RAM Port 8080 (http) Tier pro

// What it is

A closer look.

For self-hosters who think Mailcow's component-soup is unnecessary, Stalwart is the integrated single-binary alternative.

// Use cases

What it's for.

Concrete scenarios where teams pick Stalwart Mail Server over the SaaS alternative.

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Full self-hosted mail

SMTP, IMAP, JMAP, WebDAV in one binary

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Modern protocols

JMAP for fast app integration

◇

Spam filtering

built-in modern anti-spam (no Rspamd integration needed)

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Multi-domain hosting

many domains in one instance

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Anti-phishing

DMARC, ARC, DKIM, SPF, BIMI all native

// Who it's for

Built for these teams.

If your team profile matches one of these, Stalwart Mail Server is a strong fit out of the box.

Profile A

Self-hosters

wanting modern email server architecture

Profile B

Privacy-conscious individuals

running personal mail

Profile C

Small businesses

wanting integrated mail without component sprawl

Profile D

Tech enthusiasts

experimenting with JMAP

Profile E

Privacy-bound orgs

under EU data residency

// Differentiators

Why teams pick Stalwart Mail Server.

When evaluating self-hosted options for this category, here are the dimensions on which Stalwart Mail Server consistently lands above the alternatives.

✓AGPLv3 — fully open
✓Rust performance — handles 10k+ users on modest hardware
✓JMAP-native — modern email API replacing IMAP for new apps
✓Active development — strong recent OSS investment
✓Built-in anti-spam — no integration glue needed
✓Modern config — TOML + web UI

// Integrations

Connects to.

The stack you'll plug Stalwart Mail Server into — services, protocols, and adjacent apps in the BluixApps catalog.

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Protocols

SMTP, IMAP4, POP3, JMAP, ManageSieve, WebDAV

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Identity

LDAP, OpenID Connect, internal users

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Storage

local filesystem, S3-compatible, Rocks DB, FoundationDB

▣

Anti-spam

built-in DNSBL, Bayesian, ML-based

▦

Anti-virus

ClamAV integration optional

▩

DKIM/SPF/DMARC/ARC

all native

▼

Web admin

modern dashboard

// Adoption & deployment

Notable users & community

7k+ GitHub stars (rapidly growing)
Active Discord community
Backed by Stalwart Labs with sustainable open-core
Featured in modern email server roundups
Strong roadmap with frequent releases

What we ship

Docker compose: Stalwart + persistent data volume
Pinned stalwartlabs/mail-server:v0.10 (release-tagged)
HTTPS via Let's Encrypt for admin UI + JMAP
Admin via env config
DKIM + SPF + DMARC pre-configured for installed domain
Persistent volume for mail storage
Backup hook covers data volume

// Tips & operations

Run it properly.

Operational guidance from running this in production — what to do before you scale, what to lock down, what surprises people.

// PERFORMANCE

Reverse DNS required

same as any mail server

// SECURITY

DKIM + SPF + DMARC

Stalwart helps configure; do not skip

// OPERATIONS

Block port 25 reality

many cloud providers block it; verify before deploying

// RELIABILITY

JMAP for app integration

preferred over IMAP for new apps

// DEPLOYMENT

Backup is straightforward

Stalwart's data dir + config

// SCALING

Mind storage backend choice

local FS for small, S3 for production scale

1024

// min ram (MB)

// min disk (GB)

8080

// access port

http

// protocol

pro

// bluixapps tier

25:25 · 143:143 · 4190:4190 · stalwartlabs/stalwart:v0.16

// docker image

Project resources

Official sitestalw.art ↗

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