There is the indication "authentication required". Does the POP3 definition function (can you download mail)? If so, in the SMPT definition try "Login to the SMTP server using... From this POP3 definition" Tools > Internet options... | Sending (SMTP) Select the definition, press Edit See the Security tab

<p>*] Connection established to 68.142.198.51 >> 0042 220 smtp101.sbc.mail.mud.yahoo.com ESMTP << 0020 EHLO [192.168.1.6] >> 0036 250-smtp101.sbc.mail.mud.yahoo.com >> 0032 250-AUTH LOGIN PLAIN XYMCOOKIE >> 0016 250-PIPELINING >> 0019 250-SIZE 41697280 >> 0014 250 8BITMIME << 0038 MAIL FROM: SIZE=387 >> 0097 530 authentication required - for help go to http://help.yahoo.com/sbc/dsl/mail/pop/pop-11.html </p> <p> The above is copied and pasted from the error message. I can't figure out what I am doing wrong and I have been to the ATT yahoo site referenced.</p> <p> </p> <a mce_href="http://tips-snelafvallenineenweek.nl" href="http://tips-snelafvallenineenweek.nl">snel afvallen in een week</a>

What settings have been given to you by your provider?