Using ColdFusion with mail servers

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This question was posted in response to the following article: http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec22c24-70fc.html

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Undelivered email used to be routed to the undelivr folder. We then could make corrections and move it into the spool folder.

CF 9 is different. It sends the email to every server in the list and then records the last server as successfully sent. The undelivered email then disappears.

I found that if I added a bogus mail server address, to the end of the additional mail servers list in Backup Mail Servers, the undeliverable email is moved into the undelivered folder.