POP3 server and procmail?

Just trying to educate myself a little and figured this bunch knows a
little of everything, right?

What software would be responsible, for setting up POP accounts on a
server running Solaris 2.5?  If you wanted to sell extra POP boxes to a
I.P. account, what would be involved?  Can anybody enlighten me? 
(Please know that I am a very rank beginner with Unix or system adm.
tasks.  Thanks.)

Scott Hirsch          
ww(_at_)windworld(_dot_)com