Sending PHP Mail with attachment to Yahoo

[lorac]

I have used PEAR classes to send an e-mail with an attachment file from a HTML form.

It works correctly when you send it to a Hotmail address or another domain, but if you send this e-mail to an address Yahoo, the attachment file is received as encrypted text.

Yahoo doesn´t recognize an attachment file!

I would like to know if I can find a solution.

Thanks!