Been looking a lot lately at various email related projects. One of the issues I noticed as part of this work is that if you send a mail with cfmail to a gmail account that only has a cfmailpart text/plain gmail won’t render it. If you send both, it works fine.

<cfmailpart type="text/plain">Plain</cfmailpart>
<cfmailpart type="text/html"><strong>Strong HTML</strong></cfmailpart>

So, if you’re sending plain only, don’t put it in a cfmailpart. Probably shouldn’t have been in the first place, but, issue now solved.