My good friend Jake Churchill was surfing dev shed and he found this post regarding cfmail. The question is pretty easy, but one of the comments further down caught his eye. A user named mackindlays makes the statement that "Many mail services bounce CF generated mails now". Personally I do not believe there is any evidence that mail servers bounce CF generated mail any more than .NET generated mail or PHP generated mail etc. Perhaps mail servers score mail that is obviously sent from a web server as "more likely to be spam". Certainly that was a contention of my previous post on the subject. At any rate, his solution was to spoof the mail headers for Microsoft Exchange using CFMAILPARAM.