AT&T and its partners have implemented a program aimed at combating unsolicited commercial email (spam). AT&T now filters port 25, which means that many of its users are now required to send email through AT&T's own SMTP servers. If you use AT&T to gain access to the Internet (via a dial-up or DSL connection) and have purchased a Yahoo! Small Business plan that includes email, you will likely need to replace the Yahoo! SMTP server address in your POP settings with an SMTP server address specified by AT&T. See the list of settings.

You may also choose to opt out of AT&T's port 25 filtering program. If you opt out of this program, you will continue to use Yahoo!'s SMTP servers to manage your outgoing email. To opt out of the AT&T port 25 filtering program, simply make your request using AT&T's designated online form. Within 12 hours you will receive a notification from AT&T that you can once again use Yahoo!'s SMTP server to send email.

For more information about AT&T's SMTP requirements, please visit the AT&T help center or contact AT&T DSL support at 877-SBC-DSL5 (877-722-3755) or AT&T DIAL support at 866-SBC-DIAL (866-722-3425).