troubleshooting Question

SMTP relay error, only sending emails to one domain (where smtp server exists / from address is derived from).

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rtl_supportFlag for United Kingdom of Great Britain and Northern Ireland asked on
ExchangeEmail ProtocolsMicrosoft Legacy OS
13 Comments1 Solution238 ViewsLast Modified:
We have a webserver, and it is on a workgroup and it forwards smtp traffic to and smtp server on (e.g.). The problem is, it will only send mail to recepients in the It will not send to anything outside, and generates a relay error. The from address that we are using is

I can get it to work by adding the webserver to the domain. But i don't want my webserver to be on the domain, i'd prefer to keep it in a workgroup.

Is this a feature microsoft have introduced? It used to work about 6 weeks ago.
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