Projects / Qpopper


Qpopper is a widely used server for the POP3 protocol. It includes TLS/SSL support, very fast start-up times, and reduced I/O at session close. This server is fully compliant with RFCs 1939 and 2449, and supports Kerberos V4, if enabled.

Operating Systems

Recent releases

  •  01 Jul 2011 07:49

    Release Notes: A configure script and IPv6 support were added. PAM handling was improved.

    •  21 Oct 2009 02:40

      Release Notes: The "getline" function was renamed to "Qgetline" (to fix a conflict on some platforms).

      •  13 Aug 2009 07:57

        Release Notes: Some sprintf calls were replaced with qsnprintf. PATH_MAX is used instead of a hard-coded value for some buffers. An error check was added for an impossible condition in get_sub_opt to satisfy some automated code checkers. sys_nerr and sys_errlist are no longer used. A syntax error with 64-bit mode on Solaris was fixed.

        •  26 Jun 2009 05:00

          Release Notes: A C compilation error when using Kerberos was fixed.

          •  13 Nov 2008 05:43

            Release Notes: The configure script, PAM, and Makefiles were fixed. Off-by-one errors and warnings were fixed. Code for guarding memory was added. Compilation errors and warnings were fixed. A 'man' directory was provided in the tarball. Chained certs are now supported with OpenSSL.

            Recent comments

            01 Sep 2002 12:46 Nebriski

            Mail check speed
            I'm using Qpopper 4.x and I have a problem.
            I thought it was the configuration that made this slow.
            but now i have another configuration.
            P90. 64 MB's of Ram.

            If I do a mail check and the client connects to Qpopper.

            Then it goes fast checking if there is no mail (added)
            But if there is...
            The verifiing takes about 1 minut and the
            close connection about 1 to 1,5.

            I'm using the cash option.
            And now my question is, how can i make this quicker?
            If this possible?

            Maybe you can help me a little bit further.

            Kind Regards,

            Boris Nebriski

            30 Jun 2002 21:37 chram

            what is zombie?
            could anyone please give me a definition of what zombie is? when i write "top" it shows.. and i havent been able to find a definition of what it is.
            Also, how may i find out what this is?

            31 Oct 2001 06:09 gruberk

            Qpopper -> .PID
            I'm still missing the creation of an .pid file, when qpopper is started. Is this feature on your future plans of implementation or am I just overlooking this?

            15 Feb 2001 18:37 rcg

            Re: Beware!

            > Under Solaris 8, this left about 50
            > zombies around in standalone mode

            Standalone mode was new to Qpopper (it is usually run
            from inetd). I believe the problem with zombie
            processes on some platforms is fixed in current
            versions (Qpopper 3.1.2 and Qpopper LX 4.0b11).

            10 Oct 2000 10:58 shaman

            Under Solaris 8, this left about 50 zombies around in standalone mode before I ixnayed on the .13ay. I don't think this is quite a final release IMHO.


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