postfix problem

[igie]

i installed fedora core 5, used postfix as mail server.i configured main.cf file configurasi.i have one ip public.assumed 111.111.111.111.restart the postfix, i tried sent mail to gmail account, it was succesfully, but when i was reply, gmail can't connect to mail server.i tried telnet from my machine like
$telnet localhost
it's ok, no error,but when i'm tried
$telnet 111.111.111.111
connection refused

how to make postfix work ?

[jledhead]

it's ok, no error,but when i'm tried
$telnet 111.111.111.111
connection refused

how to make postfix work ?

is that telnet <yourIP> 25

also if trying to connect from the outside, is there a firewall blocking outside attempts?

[igie]

i meant $telnet 111.111.111.111 25.no firewall is started.iptables rule was flush..anything in main.cf not work ?