AT&T Postmaster Website
Email Best Practice Guidelines
AT&T requires that all email sent through its servers follows the AT&T email guidelines as well as any applicable federal, state, and local laws. Following the email guidelines does not guarantee that your email will be delivered; however, it should decrease the chances of your email being misidentified and blocked as unsolicited bulk email or spam.
AT&T email guidelines: best practices for email senders
The following guidelines will help ensure that your email will be delivered through the AT&T mail servers. If these requirements are not met, your messages may not be accepted.
- Ensure that your email follows all appropriate Requests for Comments (RFCs). http://www.rfc-editor.org
- Ensure that all email complies with the Federal Can Spam Act of 2003. http://www.spamlaws.com/federal/can-spam.shtml
- Deliver email through your ISPs mail servers, if available. Connecting directly from a dial-up or other dynamically assigned IP address is possible, but it may result in your mail not being delivered.
- Separate large quantities of email into sections and deliver at periodic intervals.
- Send messages only from IP addresses that do not appear on any Real-time Blackhole list (RBL). Connections and messages from an IP address listed under a reputable RBL may not be accepted. To have your IP address removed from an RBL, contact the list’s manager directly.
- Do not send email from an IP address where the sender’s identity changes often.
- Include proper header information on all email messages.
- Do not send messages that result in too many concurrent simultaneous connections to our mail servers.
- Do not attempt to discover email accounts by sending messages to the AT&T mail server. Servers making this attempt will be blocked by AT&T, and further legal action will be taken.