I'm using cfmail to send attachments with a remove option. And I know it's working because I am using Gmail as my mail server and I can see the email in my sent items folder in Gmail.
There are files in the C:\ColdFusion10\cfusion\Mail\Undelivr folder. When I move them to the C:\ColdFusion10\cfusion\Mail\spool folder, they get moved back into Undelivr again.
mail.log says things like:
"Error","scheduler-0","06/09/15","11:16:55",,"javax.mail.MessagingException: IOException while sending message; nested exception is: java.io.FileNotFoundException: C:\inetpub\wwwroot\myDomainName\myFileName.pdf (The system cannot find the file specified)"
So when I go to C:\inetpub\wwwroot\myDomainName\, sure enough, the attachment is not there. But I can see that the customer got the email with the attachment because I can see it in my sent items folder in Gmail.
So the email got sent, but it's in the Undelivr folder.
Lets see your CFMAIL and CFMAILPARAM tags. Any chance you have the attribute remove="true" set?