This is a short tutorial to install Postfix, Courier-authlib Dovecot and MailScanner in Opensuse 11.1 x86_64 O/s
This tutorial also working for other x86_64 o/s or 64 bit O/s

What is Dovecot ?

Dovecot is an open source IMAP and POP3 server for Linux/UNIX-like systems, written with security primarily in mind. Dovecot is an excellent choice for both small and large installations. It's fast, simple to set up, requires no special administration and it uses very little memory.

What is MailScanner ?

Here is a fastest way to fixed your dovecot if you have found any error while loading shared libraries : libsepol.so.1

If you have a centos 5.x and RHEL 5.x this error will appear when you try to running dovecot imap server.

Error shows from maillog:

[code]Jan 21 12:01:10 athena dovecot: pop3-login: pop3-login: error while loading shared libraries: libsepol.so.1: failed to map segment from shared object: Cannot allocate memory[/code]

You can fixed this by edit a dovecot.conf