qmail

cr.yp.to · checked 9 Oct 2026

#4 · Mail Server Software

Visit cr.yp.to ↗ Alternatives qmail vs Courier Mail Server

How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Mail Server Software6.3#4 of 34

qmail is a secure, reliable, efficient message transfer agent for typical Internet-connected UNIX hosts.

Pricing

qmailLatest published package listed: qmail-1.03.tar.gzFree

As cr.yp.to lists them, checked 9 Oct 2026.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: cr.yp.to
Price: Free tier
Free trial: Not stated
Compatibility: qmail includes a sendmail-compatible wrapper and supports .forward and /etc/aliases through separately available tools.
Dependencies: Some listed capabilities, including parallelism limits, RBL support, and mailing-list subscription management, use separately available tools or packages.
Designed for: The maker describes qmail as designed for typical Internet-connected UNIX hosts.
Distribution terms: The maker places the qmail package in the public domain and says it may be modified and redistributed.
Download: The maker lists qmail-1.03.tar.gz as the latest published qmail package.
License: The maker places the qmail package, specifically qmail-1.03.tar.gz, in the public domain and permits modification and redistribution.
Mailboxes: qmail optionally supports Maildir, which the maker describes as resistant to corruption during delivery if the system crashes.
Mailbox format: qmail optionally supports maildir, which the maker describes as resistant to corruption if a system crashes during delivery.
Mail delivery: The maker says qmail queues messages and writes local deliveries to disk before reporting success.
Mail handling: The maker lists virtual domains, relay control, host and user masquerading, and independent message retry schedules among qmail's capabilities.
Mailing lists: qmail supports user-managed mailing lists, VERPs for bounce handling, and automatic loop prevention, including across hosts.
Protocols: The package includes a POP3 service with UIDL and TOP support, and its 1.03 changes added QMQP client and server support.

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