I think the confusion is the customer gets the email, and in the 'preview pane', sees the email body, a separator, then the actual ASCII data that's attached. Right then, the customer is probably thinking there is a problem - without actually checking to see if a file is attached (via the 'paper-clip', or whatever icon their mail client uses to indicate an attachment).

In any case, I made the suggested change, and it works - a file is still attached, but the attachment data is no longer visible under the email body. I'm testing it using OE 6, Netscape 4.5 and 4.7.

I am waiting for our customers response re: email client they use, etc. I will respond to this thread w/ an update once I am able to get more details - in case there is a legitimate issue on their end.

Again, thanks for your help - it has been invaluable.