smtp.att.yahoo.com[98.139.221.42]:587: 220 smtp.att.yahoo.com ESMTP ready
smtp.att.yahoo.com[98.139.221.42]:587: EHLO home.bellsouth.net
smtp.att.yahoo.com[98.139.221.42]:587: 250-smtp.att.yahoo.com
smtp.att.yahoo.com[98.139.221.42]:587: 250-PIPELINING
smtp.att.yahoo.com[98.139.221.42]:587: 250-SIZE 41697280
smtp.att.yahoo.com[98.139.221.42]:587: 250-8 BITMIME
smtp.att.yahoo.com[98.139.221.42]:587: 250 STARTTLS
smtp.att.yahoo.com[98.139.221.42]:587: MAIL FROM:<d...@bellsouth.net>
Your SMTP client sends mail without turning on TLS. Therefore the
remote SMTP server does not announce AUTH, and the Your SMTP client
must not send AUTH.
Wietse
