I know this is a frequent problem, but I can't find the accurate answer here.
I had to rebuild Windows Small Business Server 2003 due to a VERY nasty malware that crippled the servre.
We rely on a smart host (because we have a dynamic IP address) to deliver the mail.
After looking through here, I followed instructions to test the server:
telnet xxx.xxx.xxx.xxx 25
RCPT TO: firstname.lastname@example.org
then it comes with this error:
553 sorry, that domain isn't in my list of allowed rcpthosts
I have added our domain to the receiptent policy.
I'm at a loss.
Maybe someone can help me walk through this issue.