Symptoms
When sending an email to an AT&T email address, the following error is returned (replace $IP with the IP address that was used to send the email and user@domain.tld with the email address that sent the email).
SMTP error from remote mail server after MAIL FROM:<user@domain.tld>:
553 5.3.0 alph762 DNSBL:RBL 521< $IP >_is_blocked.
For assistance forward this error to abuse_rbl@abuse-att.net
Description
This indicates AT&T is blocking emails from the IP address that was used to send the email.
Workaround
Send the error to the email address that is listed in the error. AT&T provides more information here:
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