Cant send email in Outlook anymore :(

[gnuel3]

I can receive fine, but whenever I try to send an email, it says:

The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was 'gnuel3 @sbcglobal.net'. Subject 'Re: Office Max Mail-In Rebates', Account: 'gnuel3 @sbcglobal.net', Server: 'smtp.sbcglobal.yahoo.com', Protocol: SMTP, Server Response: '530 authentication required - for help go to http://help.yahoo.com/help/us/sbc/dsl/mail/pop/pop-11.html', Port: 25, Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC78

and
Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'gnuel3 @sbcglobal.net', Server: 'smtp.sbcglobal.yahoo.com', Protocol: SMTP, Port: 25, Secure(SSL): No, Error Number: 0x800CCC0F
It worked fine a couple days ago, but now, I get that msg. 🙁

 

[Spyro]

Try checking the password and username settings.

 

[gnuel3]

it's correct 🙁

 

[gnuel3]

🙁

 

[loup garou]

Do you have authentication enabled? (you need to)

 

[nippyjun]

outlook express/ tools/ accounts/ properties/ servers/ check my server requires authentication/ try to check use same settings button

 

[gnuel3]

YAY! It worked, thanks everyone! 🙂

I wonder why it suddenly unchecked by itself..heh