About the AT&T Postmaster website

This site is intended for ISPs, E-mail providers and other service providers who want information about AT&T's e-mail service, how it works, and how to resolve related issues.

Service providers: To view information available on this site, see Categories below or select a category in the navigation bar at the top of the page.

AT&T Internet Services customers: Click here if you are having problems with your AT&T e-mail service.

E-mail Best Practice Guidelines

This section contains AT&T's Best Practices for E-mail Senders: Click here

Block Issues

It is never the intention of the AT&T Postmaster staff to block legitimate mail. Unfortunately, legitimate messages are sometimes blocked as a result of our antispam and antivirus measures. We would like to rectify these problems as soon as possible, but we need your help.

We have set up a website to streamline the process of requesting block-removals: http://www.att.net/bls_rbl/

Please visit this site for more information on the nondelivery-reports you might have received if you are a sender. You will also find there a form to submit requests for unblocking. This form is intended to be filled out by the administrator of sending systems that are blocked.

In most cases, requests sent through the website form will be granted and go into effect within two business days. We reserve the right to deny a request if our research shows that the sending system is in fact sending spam or otherwise abusing our network resources.

Categories

Click on a category below to see a description of the information provided in that category.

	FAQs for ISP Administrators		Reporting Violations
	IP List for Outbound Mail Servers		Acceptable Use Policy
	E-mail Error List		Legal Notices