The Yahoo! Mail SMTP server requires authentication. To learn how to configure your email application, please choose from the following supported applications:

• Outlook 2002 (XP) and 2003
• Microsoft Outlook Express
• Entourage 2001 and higher
• Eudora 5.1 and higher
• IncrediMail build 618 and higher
• Macintosh Mail Client (OS X 10.4 and higher)

Please make sure that you've entered your Yahoo! Mail address as the "From" address in your email client. You won't be able to send mail if you've entered another address.

If you have the Norton AntiVirus email feature enabled, you might have to do additional configuration to use Outlook or Outlook Express. For more information, please visit the Symantec web site.

If you've tried the above steps and continue to have problems, your ISP might not allow its users to send messages with other companies' SMTP outgoing mail servers.

If you're unable to send email, try using port 587 when sending via Yahoo!'s SMTP server. Here's how to make this change:

1. From the Tools menu, select Accounts.
2. Select your Yahoo! POP account and click the Properties button.
3. Click the Advanced tab.
4. Next to "Outgoing server (SMTP)," change port 25 to port 587.
5. Check the box for "Use Secure Sockets Layer (SSL)."
6. Click Apply. Then click OK and Close.