Unable to relay to the external server due to authentication issue

By powered182005 ·

I have setup an ms exchange server 2003 and I am having trouble to send email out to an external mailing account such as hotmail and gmail from a PC outside the exchange server domain. However, I am able to do so while I am logged on to the server using the admin account.

The error message I've been getting is "550 5.7.1 Unable to relay for".

Can anyone help?
BTW, I am sending mail using a program written in

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Solved.... haha my bad....

by powered182005 In reply to Unable to relay to the ex ...

Actually I was using .net 1.1's system.web.mail previously and i can't seem to be able to authenticate with the smtp server. After I change to the 2.0's, the problem solved.... haha

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