Just noticed that Yahoo uses QMail from this failure notice. I sent something to a bogus address so I can put real addresses in BCC only. With the number of users they have, qmail must be pretty tough.

Hi. This is the qmail-send program at yahoo.com. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out.

Brian Kelsay