What are the mail in and mail out address?

What do I need to do to fix Server Error 530, my e-mail address is correct. It works for the main account?

• 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:PLS hit Reply ALL', Account: 'plus.pop.mail.yahoo.com', Server: 'smtp.mail.yahoo.com', Protocol: SMTP, Server Response: '530 authentication required - for help go to http://help.yahoo.com/help/us/mail/pop/pop-11.html', Port: 465, Secure(SSL): Yes, Server Error: 530, Error Number: 0x800CCC78

• Answer:

  I recommend you enter your question (ERROR 0X800CCC78...and/or....SERVER ERROR 530)in the search bar of this site titled "search answers". This question has been asked before and it will bring up those questions along with the BEST answer given for each one. You can also bring those questions up AND bring up other helpful information by doing the following... I think a visit to Yahoo! Help would be helpful: - http://help.yahoo.com/l/us/yahoo/helpcentral/ Put your question in the search bar. Once replied to you will find answers to similar questions on the left side AND on the right side of this page.. As a last resort you can also put them in your web browser and bring up sites providing some help. NOTE: Please remember to pick one of the replies as the best answer by clicking on the THUMBS UP at the end of the answer you choose...thanx