Emails with attatchments

I have a client on my server with WHM, and he can't receive emails with attatchment most of the time.
It's not because of the size of the attatchemnt to but extension of the file. Ex. .url, .eml...

The files are small, only < 100K

> This message has been rejected because it has
> a potentially executable attachment "RE_ Bunn & Popeil Programs.eml"
> This form of attachment has been used by
> recent viruses or other malware.
> If you meant to send this file then please
> package it up as a zip file and resend it.

This message was created automatically by mail delivery software
> (Exim).

Any ideas to fix it?
Thanks

 

 

 

 

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