Here's what it said verbatim:

Sorry, we are unable to deliver your message to the following address.

Remote host said:554 delivery error: dd This user doesn't have a yahoo.com account. ( radiantstep3@yahoo.com">radiantstep3@yahoo.com )[0] - mta193.mail.ac4.yahoo.com [BODY]

There was a lot more gibberish below that. The blue areas were live links. I didn't click on any of them. Should I?
Thanks!
Gigi