Exchange 20003 - can't sent email externally

By jmui315 ·
I have setup Exchange 2003.
My Domain name is regiter with DYNDNS (
I installed DYNDNS client on my pc.
On my LAN i am able to sent and receive email within my own network. From outside, example - i sent a email from hotmail, yahoo or gmail to, i am able to receive it. i have no problem getting emails. But the only thing is that i can't send externally.
I am new at this.
Please help !


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