hy tuxvader
i use qmail (spamassasin+clam antivirus) and fetchmail.
u can install qmail + spamassain + qscan and more by reading the great guide at
www.qmailrocks.org
if u want poftfix or sendmail as MTA u must find some docs about integrating clam antivirus with it.
as i know fetcmail is installed by the default with fedora 1. if it is not installed, u can find its rpm in your fedora's CDs.
u can add a cron job to get emails from ISP's server per 5 minutes.
when u r root:
#crontab -e
*/5 * * * * fetchmail -f /root/get_emails
the content of /root/get_emails:
poll mail.isp.com with proto pop3
user "username" there with password "pass" is "user@domain.local" here