Inline image search failing

Hi there!

I'm interested in creating a smart mailbox that shows all messages that contain an inline image attachment. I am using the following conditions:

All of the following are true
    Content-Type > Type is image
    Content-Disposition > Type is inline

The result is nonsensical. For multipart messages, how does MailMate decide which "Content-Type" to filter on? And is there a way to make sure that the Content-Type and Content-Disposition apply to the same part of the multipart message? Is there another way to accomplish this?

Thanks!

Yogananda