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Stalwart Alternatives
Similar projects and alternatives to stalwart
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Mail-in-a-Box
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
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ImapSync
Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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Mailspring
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
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emailwiz
Script that installs/configures a Dovecot, Postfix, Spam Assassin, OpenDKIM Debian web server
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better stalwart alternative or higher similarity.
stalwart discussion
stalwart reviews and mentions
Posts with mentions or reviews of stalwart.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-06-30.
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The Email Startup Graveyard: Why 80%+ of Email Companies Fail
[2] https://github.com/stalwartlabs/stalwart
> It DOES have delivery tracking. Spam filtering is not a protocol feature and it shouldn't be. I suggest you again to educate yourself.
SMTP have extension for DSNs (Delivery Status Notifications) but crucially it does not provide information if email was classified as spam. This is a reason why many website registration form have “check spam folder”. SMTP deliverability is a hard problem both on protocol level and infrastructure on spam filtering.
> If you don't know how to build something doesn't mean it's left out to "hardcore graybeards". You got to admit you just don't know how and either learn or surrender to companies who know, offering the same for a buck. It's pretty simple.
I spend a significant amount of time investigating feasibility of building an email product and build some libraries for email protocols. It is not just my opinion but other HNs users including OP. Search HN for "self hosting email" others people experience.
- Calendars, Contacts and Files in Stalwart
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Mozilla launching "Thundermail" email service to take on Gmail, Microsoft 365
They are using stalwart, another open source product, for the backend stack. So you should be able to host your own server instance with custom domain when it gets built out. Stalwart itself just received a European funding grant to build out the features needed. From Thunderbird announcement:
> Thundermail is an email service. We want to provide email accounts to those that love Thunderbird, and we believe that we are capable of providing a better service than the other providers out there, that aligns with our values. We have been experimenting with this for a while now and are using Stalwart as the software stack we are building upon. We have been working with the Stalwart maintainer to improve its capabilities (for instance, we have pushed hard on calendar and contacts being a core piece of the stack).
https://thunderbird.topicbox.com/groups/planning/T437cd854af...
https://stalw.art/
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Revolutionizing Email: Stalwart Mail Server - Secure, Modern, and Easy to Use
View the Project on GitHub
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Purelymail: Cheap Email for Everyone
That annoying upgrade is the reason I’m planning on moving to Stalwart[1]. I’m still on the old MiaB version and I’ve always been interested in JMAP (which Stalwart supports)
[1]: https://stalw.art
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Ten Years of JMAP
JMAP is cool! It’s the only somewhat established modern way to communicate with an E-Mail server I’m aware of. Sadly it is functionally almost proprietary on the provider side; the only provider I know offering it is Fastmail. This makes it relatively uninteresting to build a client on top of.
An IMO perfect way to jumpstart adoption would be an IMAP-to-JMAP proxy, which I don’t think currently exists. It would allow people waiting to develop and use modern clients relatively easily.
Currently the best way to get non first party JMAP infrastructure seems to be to host Stalwart (https://stalw.art/) and do some trickery to forward your E-Mails there, which hasn’t been worth the effort to me so far.
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MailCatcher runs a super simple SMTP server
There's also Stalwart which I've been meaning to try out.
https://github.com/stalwartlabs/mail-server
- Unlock the Future of Email with Stalwart
- Stalwart Mail Server
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Happy 20th Anniversary, Gmail. I'm Sorry I'm Leaving You
* [1] should be https://stalw.art
It's a neat project though, that I hadn't heard of before. I have ran Postfix to do domain-wide email forwarding (to Gmail coincidentally) but going the other way around and having the end destination be self hosted is on my to-do list.
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A note from our sponsor - Stream
getstream.io | 20 Jul 2025
Stats
Basic stalwart repo stats
27
9,087
9.7
5 days ago
stalwartlabs/stalwart is an open source project licensed under GNU Affero General Public License v3.0 which is an OSI approved license.
The primary programming language of stalwart is Rust.
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