How to set up a high-capacity linux POP3 server

One: Overview

The purpose of this article is to describe how to use open source software procmail and Qpopper to configure a POP3 server that can be used by a large number of users, with a focus on maintaining optimal server performance.

Two: Steps

Software Environment for Redhat Linux 7.1

1. Download the latest version of Procmail and Qpopper

Procmail The latest version is now 3.21 available from

http://www.procmail.org/procmail-3.21.tar.gz download.

Qpopper The latest version is now 4.0 available from

http://www.eudora.com/qpopper_general/Download

2. Compile Qpopper

Suppose the downloaded file is placed in the/root

　　#cd /root
　　#tar xvfz qpopper4.0.3.tar.gz
　　#cd qpopper4.0.3
　　#./configure --enable-hash-spool=2
　　--enable-log-login
　　--enable-server-mode
　　--enable-fast-update
　　--enable-shy
　　--enable-spool-dir=/usr/mail
　　--enable-specialauth

Comments:

--enable-specialauth Use/etc/shadow password Authentication

--enable-hash-spool=2 uses level two hash structure

--enable-spool-dir=/usr/mail The user mailbox file is/usr/mail/j/e/jephe

--enable-log-login Record of successful POP3 login into syslog

--enable-server-mode and--enable-fast-update

Do not allow Qpopper to copy mailbox files to temporary files when the user accesses the mailbox

Reduces disk I/O and enhances performance

--enable-shy do not display version information when responding to a server, enhancing security

　　#make
　　#make install

Edit File/etc/inetd.conf

Create the file POP3 under/ETC/XINETD.D and include the following:

　　service pop3
　　{
　　socket_type = stream
　　protocol = tcp
　　wait = no
　　user = root
　　server = /usr/local/lib/popper
　　server_args = qpopper -F -S -s -c -R -T120
　　port = 110
　　}

Comments: