Dev tools · alternatives · 2026
24 alternatives to Stalwart Mail Server
Secure & Modern All-in-One Mail Server (IMAP, JMAP, SMTP)
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Stalwart Mail Server launched in 2024; newer entries below may have overtaken it.
- 1
I am happy to announce Stalwart JMAP [1], an open-source JSON Meta Application Protocol server that aims to be scalable, robust and secure. Some of its key features are: - JMAP Core, JMAP Mail and JMAP over WebSocket full compliance. - IMAP4 rev2/1 support via Stalwart IMAP, an imap-to-jmap proxy [2]. - Scalable and fault tolerant: consensus over Raft, node autodiscovery over gossip and read-only replicas. - RocksDB backend with full-text search support in 17 languages. - OAuth 2.0 authorization code and device authorization flows. - Domain Keys Identified Mail (DKIM) message signing. -…
2022 · github.com · its alternatives →
- 2
Distributed JMAP and IMAP server written in Rust.
2022 · stalw.art · its alternatives →
- 3
I am happy to announce Stalwart SMTP [1], a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability. It features built-in DMARC, DKIM, SPF and ARC support for message authentication, strong transport security through DANE, MTA-STS and SMTP TLS reporting, and offers great flexibility and customization thanks to its dynamic configuration rules and native support for Sieve scripts. The project has been recently awarded a grant from NLNet and the European Commission's Next Generation Internet program to develop a mail server in Rust. The next step in…
2023 · github.com · its alternatives →
- 4
Cypht is a lightweight, open-source webmail client that combines all your email accounts and RSS feeds into one unified, streamlined inbox. Supports IMAP, SMTP, JMAP, and EWS.
2016 · cypht.org · its alternatives →
- 5
Create unlimited email aliases for free. Protect your real email from spam by using a different address for each service. Privacy friendly, anonymous replies.
2019 · anonaddy.com · its alternatives →
- 6FS
2017 · develmail.com · its alternatives →
- 7
- 8
This is ymawky, a static file web server for MacOS written entirely in ARM64 assembly. It supports GET, PUT, DELETE, HEAD, and OPTIONS requests, and supports Range: bytes=X-Y headers (which allows scrubbing for video streaming). It decodes percent-encoded URLs, strictly enforces docroot, serves custom error pages for any HTTP error response, supports directory listing, and has (some) mitigations against slowloris-like attacks. I’ve also written a more detailed writeup here: https://imtomt.github.io/ymawky/
May 2026 · github.com · its alternatives →
- 9WS
WildDuck is a scalable no-SPOF IMAP/POP3 mail server
2019 · wildduck.email · its alternatives →
- 10AF
This is a side project of mine. Use this as your SMTP server in a test environment to guarantee that your users don't receive test emails. Looking for feedback, especially on the security side.
2024 · fakemail.stream · its alternatives →
- 11
MailCue▲82Run as a fully hardened production email server.
Apr 2026 · olib-ai.github.io · its alternatives →
- 12PI
Full featured solution for your email server. Native implementation of the latest anti-spam methods, webmail and easy administration included.
2015 · poste.io · its alternatives →
- 13
Access predefined IMAP mailboxes with a browser using one time passwords or a YubiKey - dividuum/one-time-mail
2016 · github.com · its alternatives →
- 14
Mailcheap▲123Email hosting, dedicated email servers, API-first platform
2018 · mailcheap.co · its alternatives →
- 15
Everything you need to start sending newsletters, drip campaigns, transactional emails. Mailcoach is a fully featured email marketing platform built for growing creators, developers, and businesses.
2020 · mailcoach.app · its alternatives →
- 16
A self-hosted IMAP/SMTP middleware designed for developers
2025 · rustmailer.com · its alternatives →
- 17
MailerLogic▲96Email API with built-in deliverability intelligence
Apr 2026 · mailerlogic.com · its alternatives →
- 18
ServiceBeard▲143ServiceBeard is an open-source sync tool which polls your IMAP server for new mail and creates new issues on your repo/project, or posts comments if it's a reply to an existing thread. In the other direction, any comments on the issue triggers an outgoing email to the customer (using your SMTP server). The obvious use-case is setting up a service desk using existing infrastructure, but I'm curious to see what other use-cases come up. I'm Joram, the solo developer who built ServiceBeard. My team was managing a shared mailbox by using coloured labels and read/unread statuses just to…
Jul 2026 · servicebeard.app · its alternatives →
- 19
- 20
SMTP‑Test.com▲103One‑click SMTP server test with real‑time protocol logs
2025 · smtp-test.com · its alternatives →
- 21
1SecMail▲112Free disposable email that actually arrives in real time
2025 · tmaily.com · its alternatives →
- 22
- 23
MailSnag▲83Automated email testing for dev/staging/QA/CI environments
2018 · mailsnag.com · its alternatives →
- 24
I wrote this JMAP MCP server that adds email management tools to Claude for searching, reading, and sending emails through FastMail and other JMAP providers in Deno!
2025 · github.com · its alternatives →
Also compare
- Distributed JMAP and IMAP Servers in Rust alternatives
- Stalwart JMAP/IMAP Server alternatives
- SMTP Server in Rust with DMARC, Dane, MTA-STS, Sieve, OTEL Support alternatives
- Cypht – Unique Open Source Webmail alternatives
- I made an open-source anonymous email forwarding service alternatives
- Fake SMTP server as a service alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →