Qpopper 4.0.18 / 4.1 Beta 17

Qpopper 4.0.18 / 4.1 Beta 17 is yet another great solution for anyone who is in need of a widely-used server for the POP3 protocol (this allows users to access their mail using any POP3 client).  Qpopper supports the latest standards, and includes a large number of optional features.  Qpopper is normally used with standard UNIX mail transfer and delivery agents such as sendmail or smail.

The 3 and later code base has multiple levels of protection again common security vulnerabilities, so even if there is a bug at one level, the other levels can protect against an exploit.  Stability means running without crashing or other problems.  All bug reports are reviewed and taken seriously.  Safety means protecting the user's mail.  Qpopper takes extra precautions to guard against spool corruption, even if there is a system crash or power failure during an update.  Qpopper provides a large number of features, such as bulletins, support for wireless devices, APOP, integration with packages such as Kerberos, drac, etc.  Qpopper strives for the maximum possible performance consistent with safety.  You can also tell Qpopper when it is running in an environment where some precautions are not required, resulting in extra performance (for example, if users do not access mail using shell accounts).

This server is fully compliant with RFC 1939 (which defines the POP protocol) and RFC 2449 (which defines the POP extension mechanism and the extended response codes), and works with all known POP3 clients.

The latest official release of Qpopper is 4.0.16.  All Qpopper users are encouraged to upgrade. The file INSTALL gives detailed installation instructions.  Please read the entire file before installing Qpopper on your system.  This file also tells you how to configure Qpopper, and how to change any of the default settings.

Major Features:

1. Mac OS X compatibility
2. Faster start-up (1,000 times faster, in many cases)
3. Reduced I/O at session end (one-third less!)
4. TLS/SSL (allows authentication and email to be strongly encrypted between any TLS/SSL-enabled mail client and Qpopper; requires TLS/SSL)
5. Plus all the great features of Qpopper 3.1 (including full sources)
   • Server mode can be set on a per-user basis, using group membership and/or user options file
     
   • Run-time options can be read from a file
     
   • Per-user run-time options file
     
   • Stand-alone daemon mode
     
   • Timing for authentication, initialization, cleanup optionally reported in log
     
   • DRAC support
     
6. Most compile-time options now are available at run-time
7. Easier administration
8. Version 4.1 provides more features:
   • IPv6 support
     
   • Significantly improved performance
     
   • Cygwin compatibility (for use under Windows)
     
   • Ability to execute arbitrary programs when users log in
     
   • Sieve filtering
     
   • And lots more