Our Community Forums will be closing on June 27, 2024. Please visit att.com/support for all your support needs.
Need to update email settings?
sevenhundredseventysix's profile

1 Message

Thursday, May 9th, 2024 6:33 PM

Unblocking a Server Address

I have a user on a server that is unable to email anyone on an AT&T address, as they keep receiving the following:

553 5.3.0 alph764 DNSBL:RBL 521< >_is_blocked.For assistance forward this error to abuse_rbl@abuse-att.net

This has happened before and we circumvented it by transferring the user to another IP, but I'm unable to do this again and any attempt at emailing the supplied at&t address in the past has resulted in silence.

Anyone know of the best way to resolve this?

Community Support


232.9K Messages

2 months ago

Hi @sevenhundredseventysix! We completely understand your concern regarding unblocking server address, and would like to help. Let's get the assistance you require.


The Community Forums are a public support option where other users, and AT&T, will try and assist with high level support needs. This means we won’t be able to look into account specific concerns. To get the help you need for your unique issue, please review our Contact Us page [www.att.com/support/contact-us/], and choose the best option to reach out to us. You can call, chat, or reach out via social media, and we can review your specific issue and provide you support. If you feel your issue isn’t account specific, and can be answered generally, please let us know, and we’ll be happy to help.


Thank you for contacting AT&T Community Forums,

Ancy, AT&T Community Specialist.

Not finding what you're looking for?
New to AT&T Community?
New to the AT&T Community? Start by visiting the Community How-To.
New to the AT&T Community?
Visit the Community How-To.