"Delete Old Messages" App question

[DikaiaKnight]

I use the Delete Old Messages app in the Market to clear out old old texts. I recently noticed that it is not deleting out any MMSs. I was wondering if there was any way to get it to? I am currently using the free version. Or maybe there is a better app out there? Also I use "Save MMS" to save pictures I get, just in case that affects it at all. Thanks guys