Just off the top of my head, completely untested: header _SUB_RECH Subject =~ /\b_SUB_RECH\b/header _CT_IS_HTML Content-Type =~ /\bname=\"*{1,100}\.html\"\s{0,10}$/
meta INV_MIME_HTML _SUB_RECH && _CT_IS_HTML describe INV_MIME_HTML Invoice with HTML attachment score INV_MIME_HTML 2
This doesn't check that the content is an attachment, but maybe will do what you want. Checking it is an attachment takes a little more work, but is certainly possible.
Loren
