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AT&T

AT&T is the world's largest telecommunications company, headquartered in Texas. It offers free email accounts for past customers at sbcglobal.net and bellsouth.net, and new and non-customers can register an att.net or currently.com free email account. AT&T provides a detailed Postmaster page with contact options for investigating false-positive spam verdicts.

Domains

  • att.net
  • sbcglobal.net
  • swbell.net
  • bellsouth.net
  • pacbell.net
  • prodigy.com

Documentation

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550All 550 codes →

smtp;550 5.2.1 <EXAMPLE@PRODIGY.NET>... Addressee unknown, relay=[x.xx.xx.xx]

smtp;550 5.2.1 <example@prodigy.net>... blank mailhost - invalid address, relay=[x.xx.xx.xx]

smtp;550 5.7.1 Connections not accepted from servers without a valid sender domain. ## Fix reverse DNS for x.xx.xx.xx

High severity

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