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sneader's profile

2 Messages

Friday, March 22nd, 2024 4:46 PM

552 5.2.0 blocked AUP#BL bounce when sending mail to [email scrubbed]

I am a sysadmin from a hosting provider.  When customers send mail to [email scrubbed] from ONE of our servers, the messages are always blocked with:

552 5.2.0 x.x.x.x blocked AUP#BL

If the exact same message are sent via one of our other servers, it is delivered fine.  So, it appears that the issue is with just one of our servers.  FYI, that same server can send messages fine to [email scrubbed] -- the issue is only with ##########@txt.att.net.

How can this be resolved?

- Scott

Community Support

 • 

232.3K Messages

2 months ago

Hi @sneader, we understand your concern. Let's get the help you need with receiving email.

You may have blocked either their email address or domain extensions (for example, com, org, net). Check if you have the Blocked Addresses feature enabled and unblock the email address.

If no erroneous blocks were found, or no blocked addresses exist, check the filters. You may have created email filters. There may be a filter with simply a period or comma. You may not see it, but any email with a comma or period falls into the filter rules. Thoroughly check all filters.

Let us know how it goes!

Thank you for contacting AT&T Community Forums.

Jasmine, AT&T Community Specialist

2 Messages

2 months ago

Hi Jasmine!  Thanks for the quick reply.  I may have not explained the situation well, so I'll try a different way.  I am not an att.net end user but, rather, an administrator of a hosting provider.  One of our customers is trying to send mail to one of your customers, via your email to SMS gateway addresses (i.e. ##########@txt.att.net.  However,att.net is blocking the messages with the SMTP error "552 5.2.0 x.x.x.x blocked AUP#BL".  

Thus, this is not a filter or problem on our end, and there is nothing at our end that we can do to fix this. Rather, we need to find someone at att.net (postmaster team?) that can investigate why mail from our IP is being blocked, if the destination is anything @txt.att.net. I can DM the IP if that would be helpful.

- Scott

Community Support

 • 

232.3K Messages

2 months ago

Hi @sneader, thank you for writing back to us. We understand your concern, and let's point you in the right direction.

We recommend that you email abuse@att.net with a clear explanation subject line so that we can investigate further and assist you. 

You can check out this article and get AT&T Mail postmaster help.

Please keep in mind that sending multiple requests may be considered spam. 

Please feel free to reach out to us for further assistance.

 

Thank you for contacting AT&T Community Forums.

 

Jasmine, AT&T Community Specialist

2 Messages

7 days ago

Hello, i have couple of servers and ip addresses that i use to send email to text but recently, all the ip range in my servers were blocked even the ones i did not use to send email to text. Below is the error response i get <Permanent SMTP delivery error when sending to 52.37.9.126:25 (att-e2xms-west.mx.a.cloudfilter.net)

552 5.2.0 1.2.3.4 blocked AUP#BL

Is this block placed by att itself or cloudfilter? if it is att, how can i get my ip range unblocked and functional again and if it is cloudfilter, how can i get through to them to delist my ip.  I look forward to your response. Regards

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