selective IFRAME filtering

[Gary Smithe]

Hi,
     I subscribe to a couple of comics from comics.com, and 1 of them is filtered as having an IFRAME html code (but not the other - weird).  Anyway, is there a way to add this to a whitelist or something since I know it is benign (I'd like to catch all other IFRAME tags though).
 
I'm not using any AV software on this relay, that's handled on the hidden exchange server - this is just the built-in filter.
 
Thanks,
Gary