unable send mail.



sir, i have created my account in outlook for my one email account and my
account.
my problem is that i am recieving mail from all the mail server like
yahoomail, gmail, hotmail etc. but when i tried to send reply for the mail
recieved from these mail server. i recieved this ERROR..

The following recipient(s) cannot be reached:

'yusufzaitahseen@xxxxxxxxx' on 10/8/2008 10:33 AM
550 not local host yahoo.com, not a gateway
tell me the solution for this problem.
.



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