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Mon, Jan 28, 2019 3:01 PM
5.3.0 flpd591 DNSBL:rbl 521
The above is the error we receive at a clients location.
Any clear insight would be great to get this resolved.
2 years ago
Thanks for reaching out on the forums, we're here to help! To get started can you confirm if this is a residential account or a business account? Additionally, have you already sent an email to firstname.lastname@example.org, if not you can check out our Postmaster site for more information. We look forward to hearing back from you!
James C., AT&T Community Specialist
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5.3.0 flpd591 dnsbl:rbl 521