Qmail on my redhat machine can't receiving mail

["Edward Nainggolan" <edw412do hotmail com>]

I use Redhat 6.1 with qmail server run.

All SMTP and POP3 running well, from local all test run correctly, but why 
if I send email from outside or remote computer, the qmail server cannot 
receive it.

Please...all mailexpert help me. I must run an email server on my office 
while I'm just a newby on Linux...

Thanx....4 u all.
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