Dev tools · alternatives · 2026
24 alternatives to Self-hosted email server for 2026 – single binary, CalDAV
Built this after getting frustrated with the paying to a google for email. Now running it for 1 months in production. What it does: - Full SMTP server (inbound/outbound, DKIM signing, SPF/DMARC checking) - IMAP with IDLE support - CalDAV/CardDAV (replace Google Calendar/Contacts) - Web admin panel with Prometheus metrics - Greylisting for spam prevention - Auto-discovery (mail clients configure themselves) - Audit logging for compliance What it doesn't do: - Webmail (use Roundcube, etc.) - ML-based spam filtering (greylisting + basic heuristics only) - Clustering/HA
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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modern full-featured open source secure mail server for low-maintenance self-hosted email - mjl-/mox
2023 · github.com · its alternatives →
- 2
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 →
- 3BS
Hello all, I have been working on a self hosted CalDAV calendar client Bloben https://github.com/nibdo/bloben-app This is mostly an alternative to other web clients like great AgenDAV with some additional features I wanted to use like email invites, alarms, webcalendars, etc. You can play with demo (limited to read access) here: https://demo.bloben.com/api/v1/users/login-demo?username=dem... In the end it should provide separate clients also for CalDAV tasks and notes. One thing I would maybe like to discuss more is adding encryption, which…
2022 · its alternatives →
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Polymail Web▲437All-in-one email platform for sales communication
2018 · polymail.io · its alternatives →
- 5IM
2013 · khamidou.github.io · its alternatives →
- 6
High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app. - knadh/listmonk
2019 · github.com · its alternatives →
- 7
Sidemail 2.0▲306Hi all! I'm Kristyna, maker of Sidemail. I'd love to share with you what we've been building. We built Sidemail because sending emails from a SaaS app was way harder than it should be. Sidemail is made for developers and teams that want one simple place to handle SaaS emails with reliable delivery and no bloat. It has: - Everything for creating, managing and delivering SaaS emails in one platform, - Easy-to-use email API for sending password resets, receipts, etc. - Messenger for writing product updates and newsletters, - Email automations for onboarding and lifecycle flows, - Fast email…
Nov 2025 · sidemail.io · its alternatives →
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HappyMail▲201Eight years ago, I was job hunting and felt embarrassed by my Gmail address. I tried registering firstname.lastname — taken everywhere. So I thought: "I'm in IT, I'll set up my own domain with my own IMAP/SMTP. How hard could it be?" A lot went wrong. Forgotten renewals. rocky DNS mistakes. I ended migrating toward Google Workspace, but in the end it felt overkill, having a subscription there plus the whole registrar subscription, and the whole GAFAM sticker on it. Moreover, the final price was way too high for me at the time. Six months ago, someone approached me and related to that…
Jan 2026 · happymail.tech · its alternatives →
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2016 · migadu.com · its alternatives →
- 12
- 13AF
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 →
- 14
Introducing Posthorn, a self hosted email gateway. One docker container (or Go binary) between every self hosted app on your VPS and your transactional email provider. Set up Posthorn once, point your apps to it, done. I was trying to deploy Ghost on a DigitalOcean droplet and found that DO and many different VPS services have started to block the default SMTP ports to try to combat the various types of abuse they get. To actually configure my app, I had to hack together a Postfix relay. In another project, I had a static site which had a contact form, but my free Formspree account was…
May 2026 · github.com · its alternatives →
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Mailcheap▲123Email hosting, dedicated email servers, API-first platform
2018 · mailcheap.co · its alternatives →
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Cleanmails - Unlimited email verification
Jan 2026 · its alternatives →
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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 →
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SFTPGo 0.9.6▲69Full-featured and highly configurable SFTP, HTTP/S, FTP/S and WebDAV server - S3, Google Cloud Storage, Azure Blob - Release 0.9.6 · drakkan/sftpgo
2020 · github.com · its alternatives →
- 20FS
2017 · develmail.com · its alternatives →
- 21
MailCue▲82Run as a fully hardened production email server.
Apr 2026 · olib-ai.github.io · its alternatives →
- 22
MailSnag▲83Automated email testing for dev/staging/QA/CI environments
2018 · mailsnag.com · its alternatives →
- 23MD
2022 · minimail.eu.org · its alternatives →
- 24
Also compare
- Mox - Modern full-featured low-maintenance self-hosted mail server alternatives
- I made an open-source anonymous email forwarding service alternatives
- Bloben – Self-hosted web CalDAV calendar client alternatives
- Polymail Web alternatives
- I'm working on an open-source Gmail replacement alternatives
- Listmonk – Fast self-hosted newsletter and mailing list manager 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 →