cant get mail working

so finally i got dedicated server cant get mail working. amd 3200+, 2gigs ram, 100mbps connection... but it was with apache, proftpd, mysql and php and few other things installed.
i installed vhcs2 control panel. after few days messing around, it works fine. ftp, mysql, apache..... just perfect. but mail isnt working at all. users seems to be created but they cant login trough webmail and pop3 both. where should i look for problem?
and php mail() isnt working because it use sendmail which is actually disabled. how can i setup php to use postfix?

i'm under fedora core 4

 

 

 

 

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