popa3d - a tiny POP3 daemon

popa3d is a tiny POP3 daemon designed with security as the primary goal. You can read more about its design, check out the change log, or download a popa3d tarball (the latest stable version is recommended) and refer to the documentation inside.

Download:

• popa3d 1.0.2 and its signature
• popa3d 1.0.1 and its signature
• popa3d 1.0 and its signature
• popa3d 0.6.4.1 and its signature

These and older versions of popa3d are also available via FTP. The source code of popa3d may be browsed via CVSweb.

Follow this link for information on verifying the signatures.

There's a mailing list where you can share your experience with popa3d and ask questions. Please be sure to specify an informative message subject whenever you post to the list (that is, something better than "question" or "problem"). To subscribe, send an empty message to <popa3d-users-subscribe at lists.openwall.com> or enter your e-mail address below. You will be required to confirm your subscription by "replying" to the automated confirmation request that will be sent to you. You will be able to unsubscribe at any time and we will not use your e-mail address for any other purposes or share it with a third party. The list archives are available on MARC and Gmane, as well as locally.

Commercial support for popa3d is available, please check out our services. We may help you install popa3d or even help you integrate it into an existing mail server and mail user database setup you might have. The latter might be a combination of our free software development and consulting services.

Contributed popa3d resources (note: I haven't audited any of these):

Packages:

• popa3d directory in OpenBSD base tree, maintained primarily by Camiel Dobbelaar
• FreeBSD port in the ports collection, by Sergey Samoyloff
• NetBSD package in the packages collection, by Thomas Klausner
• popa3d 0.5+ is a part of Debian, maintained by Krzysztof Krzyzaniak
• Slackware package of popa3d
• popa3d 0.6.3 src and i386 RPM for Red Hat Linux 7+, by Marcin Siennicki and Scarab

Related utilities:

• A simple Perl script to add mail users, by Tim van Erven

Patches (the popa3d 0.6+ patches should also apply to 1.0):

• popa3d Maildir support, by Hallgrimur H. Gunnarsson and Cory Visi
• popa3d name-based virtual domains, by Hallgrimur H. Gunnarsson
• popa3d 0.6.2+ hashed spool support, by Damir Bikmuhametov
• popa3d 0.5.9 "user mode" (for fetchmail's "plugin"), by Maciek Pasternacki
• popa3d 0.5.1 IPv6 support patch, by Jun-ichiro itojun Hagino
• popa3d 0.5.1 MySQL + virtual domains hack, by Ury
• popa3d 0.4 Kerberos v4 (KPOP) authentication patch, by Dug Song
• popa3d 0.4 APOP authentication patch for OpenBSD, by Dug Song
• ...made to work on non-OpenBSD, by Denis Ducamp
• popa3d 0.4 POP-before-SMTP patch (via whoson), by Tomasz Rzad
• popa3d 0.6.2/0.6.3 whoson support, by Damir Bikmuhametov
• popa3d 0.4 POP-before-SMTP patch (sendmail), by Garry Glendown
• ...updated to popa3d 0.6.4.1 and Berkeley DB 4, by Code Monkeyboy
• popa3d 0.4 /etc/pop3.{allow,deny} support patch, by Lukasz Luzar

The use of APOP is not recommended.
The preferred way to do POP-before-SMTP is via whoson.

Obsolete patches which are no longer needed with popa3d 0.5+:

• popa3d 0.4 qmail $HOME/Mailbox patch, by Marcin Siennicki
• popa3d 0.4 fcntl(2) locking patch for Solaris, by Thomas Klausner
• popa3d 0.3 PAM patches for FreeBSD, by farmer joe

popa3d has been integrated into OpenBSD 3.0+. It is the default POP3 server on Owl, recent versions of Slackware, and distributions by ALT Linux team. popa3d is also a part of Debian GNU/Linux, Gentoo Linux, and ASPLinux.

popa3d is a registered project with freshmeat and Ohloh.

Support further work on this software with donations.

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