SHSelfHostIndex

Mail Servers

Own your inbox with self-hosted email servers and full mail-stack solutions.

98 self-hosted apps · 190 comparisons

All mail servers apps

Last reviewed Aug 26, 2026 · 475 words

The software is the easy half of self-hosting email. Every stack below will receive mail reliably on day one; the multi-year project is keeping your outbound mail out of Gmail's spam folder, and no amount of software fixes a bad sending IP. Read the honest case for self-hosted email before committing, then choose with open eyes.

How to choose a mail stack

Three different jobs hide under "mail server", and confusing them wastes weekends. Receiving and reading your own mail needs a full stack: SMTP, IMAP, spam filtering, a pile of DNS records. Sending application or newsletter mail needs a delivery platform instead — listmonk (23,000 GitHub stars) for newsletters, Postal for transactional sends, Mautic for full marketing automation. Capturing mail during development needs neither: MailHog or Mailpit run a fake SMTP server in 64 MB and show everything in a web UI.

For the full-stack job, the real split is bundle versus binary. mailcow preconfigures Postfix, Dovecot, Rspamd, and SOGo webmail across a fleet of containers and wants 6 GB of RAM in exchange for everything working together out of the box. Docker Mailserver compresses Postfix and Dovecot into one container with file-based, version-controllable config in 2 GB, but ships no webmail and assumes you know what a milter is. Stalwart rewrites the whole stack in Rust: JMAP, IMAP, and SMTP in a single binary on 512 MB with a web admin — younger than the legacy stacks, far simpler to operate.

Where to start

Mail-in-a-Box is the beginner pick: one command on a clean Ubuntu server sets up mail, DNS, TLS, Roundcube webmail, and an admin dashboard, and it runs in 1 GB. The trade is that it wants the whole machine and resists customization. mailcow wins for a household or small team that wants webmail, ActiveSync for phones, and a management UI — if you can feed it 6 GB. Stalwart wins for anyone who values one process, strong security defaults, and modern protocols over 25 years of accumulated Postfix folklore.

The reputation tax

Whatever you deploy, budget for the part the READMEs skip: a static IP with a clean history, matching reverse DNS, correct SPF, DKIM, and DMARC records, and weeks of low-volume sending before the big providers trust you. Most residential ISPs and several VPS hosts block outbound port 25 entirely — confirm yours doesn't before paying for anything. Postal's documentation is blunt about needing careful IP reputation management, and that warning applies to every tool on this page.

For a first mail server: Mail-in-a-Box on a cheap dedicated VPS with port 25 open and a clean IP, doing nothing else. Graduate to mailcow or Stalwart once you know you enjoy being a postmaster.

Curated picks

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Mail Servers comparisons

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