Ist this postfix mail server (on FC6) or other?
Have you a pop3 server installed like qpopper?
If you dont say, install nmap and post the output from:
Why you speek from " modem(com port of modem ) " You dont have a Network line?
If you like only forward mail to other server and filter its , and transmit mail on modem phone line, qmail can handle this.. see http://qmail.org/top.html and you must not write a client. And spen a lot of time an idigest problem.
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