help! unable to send email with windows mail??

[lalando]

I was able to send and receive until 5 minutes ago, I tried to send an email
and got this error message
The message could not be sent. The authentication setting might not be
correct for your outgoing e-mail [SMTP] server. For help solving this
problem, go to Help, search for "Troubleshoot Windows Mail", and read the
"I'm having problems sending e-mail" section. If you need help determining
the proper server settings, please contact your e-mail service provider.

The rejected e-mail address was '(e-mail address removed)'. Subject 'Re:
playdate', Account: 'pop.att.yahoo.com', Server: 'smtp.att.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

I have checked my smtp settings and they seem to be fine (no authentication
required) I did not change anything between teh time I was able to send and
the time I was unable to... help???

 

[Gary VanderMolen]

The published settings for that server have not recommended port 25
for a long time. Change your port and SSL settings to agree with:

http://helpme.att.net/article.php?item=10707

 

[Gary VanderMolen]

US-based free Yahoo accounts have webmail access only,
no POP access. Windows Mail handles POP mail but not
webmail. There are two Yahoo solutions:

1. How did you access Yahoo mail before? If you are happy with
webmail via your browser, you can continue to use that.

2. Pay Yahoo to get their premium "Mail Plus" service:
http://help.yahoo.com/l/us/yahoo/mail/original/mailplus/overview/index.html
and use the special settings for that service:
http://help.yahoo.com/l/us/yahoo/mail/original/mailplus/pop/pop-14.html

If you are OK with using a non-Yahoo email address, you have two other
solutions:
3. Use the email address assigned to you by your ISP.
4. Get a free Gmail account.

 

[Gary VanderMolen]

Assuming that all your settings agree with
http://help.yahoo.com/l/us/yahoo/mail/original/mailplus/pop/pop-14.html
then failure to authenticate can be due to several other causes:
a) Yahoo did not follow through and upgrade you to Mail Plus.
b) That account is corrupted. Delete it, restart Windows Mail,
then recreate that account.
c) Your antivirus is interfering. Which one is it?