[imp] IMP can't send certain attachments?

[rtse at microenergy.com]

Hi everyone,

I'm fairly new at using IMP here so bear with me. I've just set u IMP and 
everything went smoothly. However, when I tested it I found that trying to 
attach certain files (pdf, exe) would result in a "file not found " or 
something to that effect. Meanwhile other files would work (txt). I'm fairly 
sure the size doesn't have anything to do with it, plus the files came from 
the same directory. It seems related to the file type. Any ideas?

Thanks
Ryan