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Internal email not routed error #5.1.1 only external works.

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victorthomas

victorthomas

Programmer
Nov 26, 2003
12
US
I'm using an exchange server actually SBS 2003 and a 3rd party POP3 connector to get external e-mail and route to exchange.

All external e-mail routing works however users of the exchange server CANNOT send e-mail messages among themselves or internally, if they do they get a:

“User doesn’t exist message” unable to deliver to user <#5.1.1>

Can anyone provide some guidance or assistance in helping me solve this issue.

Thanks.
 
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