Issue:
Just finished troubleshooting a annoying issue. We have moved some public facing IIS servers on to shared hosting. We had configured SMTP to forward to our other closed network. The issue we were having was that our emails from each of the web apps were going out but not ever arriving within our local domains.
The issue was the smtp forwarder inside our local network. The smtp forwarder has a white list which was refusing any mail sent from this new public service. We added the new domain into the white list and now the emails are passed through from our externally hosted servers.
Solution:
Each web application needs to have the from domain set correctly or the whitelist will block it. If you find your emails blocked don't forget to view the badmail folder on your IIS server. This is by default located at C:\Inetpub\mailroot\badmail.
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