Entire message is only an attachment, no associated text.

[sc...@inapac.com]

Is there a method to marking messages that are only specific types of
attachments (i.e. some-file.gif or other-file.dbl) OTHER than marking
the file type (gif or dbl in this example) as not allowed?  

The messages coming in have only an attachment, there is no associated
text with them.  I'm betting that either there was supposed to be some
or will be some html included somewhere but is probably accidentally not
included.

We do on occasion send messages with gifs as attachments, but always
have additional text with them.

To expand slightly on the above scenario:  Would HTML be regarded as
text in this kind of message or is SpamAssassin smart enough to
recognize HTML formatted text and a graphic as different than HTML and a
graphic?

Thanks for any thoughts, input and hopefully enlightenment on the
problem!
Scott