Cannot SEND email in outlook 2002...I can receive, but not SEND/RE

The error I receive is this: 
Task 'pop.att.yahoo.com - Sending' reported error (0x800CCC78) : 'Unable to 
send the message. Please verify the e-mail address in your account 
properties.  The server responded: 530 authentication required - for help go 
to  http://www.**--****.com/ '

Obviously I have checked the email addresses...in fact, I cannot even send a 
test message from myself to myself!  My att webmail works fine - so i have 
been sending messages that way - but this is exasperating having to use both 
the webmail and outlook!! ...and i've used outlook 2002 since 2002, so I have 
7 years of business information on this that I do not want to particularly 
scrap.  I don't know what to do - i've had tons of trouble with Outlook in 
the past 2 weeks and not sure what has caused it. HELP!

Use authentication for outgoing mail and use yahoo login for it and change 
the outgoing mail port.

# Yahoo! Mail Settings

Yahoo Mail offers standard POP3 access for receiving emails incoming through 
your Yahoo mailbox, by using your favorite email client software. To setup 
your email client for working with your Yahoo account, you need to select the 
POP3 protocol and use the following mail server settings:

      Yahoo Incoming Mail Server (POP3) - pop.mail.yahoo.com (port 110)

      Yahoo Outgoing Mail Server (SMTP) - smtp.mail.yahoo.com (port 25)

POP Yahoo! Mail Plus email server settings

      Yahoo Plus Incoming Mail Server (POP3) - plus.pop.mail.yahoo.com (SSL 
enabled, port 995)

      Yahoo Plus Outgoing Mail Server (SMTP) - plus.smtp.mail.yahoo.com (SSL 
enabled, port 465, use authentication)

What outgoing SMTP port are you using?

Set Outgoing Mail Port to 587 in Outlook Express, Outlook 2000 and Outlook
2002/2003
To change the outgoing mail port to 587 in Outlook Express and Outlook 2000:
1. Open Outlook Express or Outlook 2000.
2. Click the Tools menu, then click Accounts.
3. Click your e-mail account, then click the Properties button.
4. Click the Advanced tab.
5. In the Outgoing Mail (SMTP) box, type 587.
6. Click the OK button.
7. Click the Close button.

To change the outgoing mail port to 587 in Outlook2002/2003:
1. Open Outlook 2002 or 2003.
2. Click the Tools menu, then click E-mail Accounts.
3. Click the View or change existing e-mail accounts option, then click the
Next button.
4. Click your e-mail account, then click the Change button.
5. Click the More Settings button.
6. Click the Advanced tab.
7. In the Outgoing Mail (SMTP) box type 587.
8. Click the OK button.
9. Click the Next button.
10. Click the Finish button.






to>
> send the message. Please verify the e-mail address in your account>
> properties.  The server responded: 530 authentication required - for help
go>
> to  http://www.**--****.com/ '>
>>
> Obviously I have checked the email addresses...in fact, I cannot even send
a>
> test message from myself to myself!  My att webmail works fine - so i have>
> been sending messages that way - but this is exasperating having to use
both>
> the webmail and outlook!! ...and i've used outlook 2002 since 2002, so I
have>
> 7 years of business information on this that I do not want to particularly>
> scrap.  I don't know what to do - i've had tons of trouble with Outlook in>
> the past 2 weeks and not sure what has caused it. HELP!>
>

In addition to changing your outgoing SMTP port, also make sure you check
the box that says to authenticate to your outgoing SMTP server.






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