e-mail help

on trying to reply to an e-mail i got this error report:-
The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was '[email protected]'. Subject 'Re: NFOsurvey: Short screening question (toothbrush)', Account: 'pop.mail.yahoo.com', Server: 'smtp.mail.yahoo.com', Protocol: SMTP, Server Response: '530 authentication required - for help go to click here', Port: 25, Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC78
can any body help me
o/s winxp pro
outlook express 6
thanks in anticipation

  jazzypop 23:32 07 Jan 03

Does this help? - click here and check the section regarding authentication

This thread is now locked and can not be replied to.

Surface Pro (2017) vs Surface Pro 4

Where HTML5 is headed next

MacBook Pro v Surface Pro 5