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550 relaing denied when you send mail from outside

Posted on 2006-05-18
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Last Modified: 2012-06-27
I have Exchange 5.5 on nt 4 I put all needed checkmarks on routing restrictions tab in IMS properties and it work fine
Now some users start work outside of our network using laptops. They connect to internet using any available connection
Users can recieve mail can send mail  to someone@mydomain.com (our email domain) but if they send mail to any different
 domain (like yahoo, hotmail...) they getting error 550 relaying denied
Haw I can let them send mail to any email address?
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Question by:borisdv
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Sembee earned 400 total points
ID: 16713572
If they are connecting via POP3/SMTP then they will need to authenticate to send email.
The format for Exchange 5.5 SMTP authentication is (if I remember correctly) domain\username\alias

Simon.
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by:borisdv
ID: 16719374
you mean put it in outlook there "my outgoing server(smtp) req identification" put user name domain\username
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Expert Comment

by:Sembee
ID: 16722617
Correct. Configure Outgoing authentication, but the authentication username needs to be in the format that I have outlined above. I don't think domain\username works on Exchange 5.5 (but it has been a while so I might be wrong).

Simon.
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