There is a new feature in Windows server 2008 for the SMTP service, which about drove myself and another tech crazy today, but I didn’t find it documented anywhere!
When you configure the SMTP service’s FQDN, then save and close the SMTP Virtual Server properties, any attempt to change the IP from then on is based on the DNS resolution for that FQDN, or what the system sees it as. This means that a completely incorrect value may be your only option!
This issue did not occur in 2003, we tested it, but a fresh VM of 2k8 immediately experienced the flaw. So, why isn’t this documented anywhere? Spin up your own VM to confirm… It’s worth the test.
The fix? As you may have guessed, reconfigure your Virtual SMTP to ‘localhost’ then save, close and re-open properties. You can now set your desired IP listener value. When finished, hop over to the Delivery options and reset your FQDN, then save. Sad that this little issue is such a pain-in-the-butt.
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Gee whiz, and I tohught this would be hard to find out.
Smart thinking – a clveer way of looking at it.