this is obsolete doc -- see http://doc.nethence.com/ instead

vm-pop3d -- mbox virtual hosts 

http://pbraun.nethence.com/doc/mail/postoffice.html 

http://pbraun.nethence.com/doc/mail/vm-pop3d.html 

http://pbraun.nethence.com/doc/mail/dovecot.html 

http://pbraun.nethence.com/doc/mail/spamass-milter.html 

http://pbraun.nethence.com/doc/mail/procmail.html 

Prepare the system 

See Postoffice smtp server virtual mbox configuration (http://pbraun.nethence.com/doc/mail/postoffice.html) 

Install and configure vm-pop3d 

Ge the latest vm-pop3d tarball (http://www.reedmedia.net/software/virtualmail-pop3d/#download) 

Extract it, 

tar xvzf vm-pop3d-1.1.6.tar.gz

cd vm-pop3d-1.1.6

compile and install it, 

./configure --help

./configure --enable-virtual

make clean

make

su

make install

Start the daemon, 

/usr/local/sbin/vm-pop3d -umail -gmail -d2

Note. add this to "/etc/rc.local" to start at boot time. 

References 

virtualmail-pop3d (aka vm-pop3d) : http://www.reedmedia.net/software/virtualmail-pop3d/