Exchange 2010, Attachment removed

Hi

A customer has some credit card mashines. They are sending mails with csv attached.

When they are received on the Exchange 2010 servers, the attachtment and the text in the body is removed.

If they relay over a 3rd party smtp server, everything is fine.

Any idea what can cause this?

Should I try the "AllowInvalidAttachment" in the EdgeTransport.exe.config?

BR
Steen