I'm not from AT&T, but that page contains three errors and three "What to do"
sections. The section referring to RFC 2317 is for DNS errors:
“550 Error. Blocked for status: <unknown sender>”: This error indicates that no
identifying information has been entered into the DNS (Domain Name System) for
this sending system. The AT&T Worldnet mail system, like many others, does not
accept messages from mail systems with no DNS records.
The "Spam complaint" section has a different "What to do:"
What to do: Ask the administrator of your mail system to contact us through our
System Administrators' page and provide the information we need to investigate
the problem.
Paul Vixie wrote:
> What to do: Ask your system administrator to submit identifying information
> to the DNS. For more information, your administrator should refer to
> http://www.faqs.org/rfcs/rfc2317.html In the meantime, you should use a
> fully registered domain for sending your messages, such as the mail system
> from an ISP or one of the major free e-mail services.
>
> now, i count myself as a master of the obscure reference, but this is over
> the top. can someone from at&t worldnet please contact me for the purpose
> of explaining what RFC 2317 could possibly have to do with spam complaints?