03-15-2018 11:39 AM
I am trying to get our company mail server unblocked. We are not on any of the top 94 RBLs according to mxtoolbox.com (including spamhaus.org.) This system serves email for a medical practice, and the inability to send to att.net or sbcglobal.net is causing significant disruption to our business operations.
Here is the response we receive from our server when sending to att.net:
<firstname.lastname@example.org>: host ff-ip4-mx-vip1.prodigy.net[220.127.116.11] said:
553 5.3.0 flpd579 DNSBL:ATTRBL 521< 18.104.22.168 >_is_blocked.For
assistance forward this email to email@example.com (in reply to MAIL
The system was put into service on its current static IP approximately two months ago, and was already blocked by AT&T on the day it went live. I have to assume it was from a previous owner of that IP or a general block of our hosting service's address range. I have repeatedly emailed firstname.lastname@example.org in the time since, receiving nothing but automated replies.
Please let me know if there is any other information you require to unblock our IP.
Solved by: Go to Solution.
03-16-2018 1:28 PM
Thank you for reaching out to us. I understand your concern with being unable to send e-mails to AT&T addresses. It would be my pleasure look into this with you!
I appreciate you sending a message to our email@example.com and trying to get the issue fixed this way. Due to a glitch in the email system, a lot of customers were receiving messages or their messages weren’t going through properly. I’m happy to say the issue has been fixed and we are receiving emails correctly now.
If you could try sending them a massage again, they should be able to get it working for you. I do want to let you know though; there might be a slightly longer wait time on a response from them since they are catching up.
We also have this great article on how to fix a variety of email issues, which you may find useful. Plus, it also has the email address in it, in case it ever changes.
If you have any other questions or concerns, please don't hesitate to reach out to us. We’re always happy to help! Thank you for your time and have a great day!
John, AT&T Community Specialist
05-24-2018 4:24 PM
Hi AT&T Admin,
We recently changed our mail server and now we have a new IP address. Since doing this our employees have not been able to email any sbcglobal.net email addresses.
I sent an email to firstname.lastname@example.org last Wednesday 5/16/18, but I have yet to receive a response. Also, our employees are getting annoyed by the bounce backs and having to find other ways to contacts these email sbcglobal.net email addresses.
Could you please unblock our new IP address: 22.214.171.124
Below is a screenshot of the bounce back email. Also, please let me know after you’ve removed us from your block list. Thanks!
flph393.prodigy.net rejected your message to the following email addresses:
Your message couldn't be delivered. Try to send it again later. If the problem continues, please contact your helpdesk.
flph393.prodigy.net gave this error:
flph393 DNSBL:ATTRBL 521< 126.96.36.199 >_is_blocked.For assistance forward this email to email@example.com
Diagnostic information for administrators:
Generating server: Mannix.trinity.local
07-16-2018 12:00 PM
ATT is blocking our MX relay server again, can you please unblock?
IP: 188.8.131.52 ff-ip4-mx-vip1.prodigy.net #<ff-ip4-mx-vip1.prodigy.net #5.3.0 smtp; 553 5.3.0 flpd591 DNSBL:ATTRBL 521< 184.108.40.206 >_is_blocked.For assistance forward this email to firstname.lastname@example.org> #SMTP#
11-14-2018 5:28 AM
We have received a bounceback/deferred and looks like you have blocked our Domain/IP Address. We verified that our Domains/IP addresses are not listed in any of the RBL's. We have everything going good with Authentication and following the best practices in Email from Sending to Receiving including the Double Opt-in Database which we use. And we do maintain a good Relationship with the clients/customers.
Below is the Error code for Further Reference:
2018-11-14 07:37:45.954270500 deferral: to: email@example.com toid: 365 from: firstname.lastname@example.org toip: 220.127.116.11 fromip: 18.104.22.168 mid: 42585 time: 0 status: 553 5.3.0 alph161 DNSBL:ATTRBL 521< 22.214.171.124 >_is_blocked.For assistance forward this email to email@example.com
2018-11-14 07:58:25.781297500 deferral: to: firstname.lastname@example.org toid: 270 from: email@example.com toip: 126.96.36.199 fromip: 188.8.131.52 mid: 42585 time: 1 status: 553 5.3.0 flpd586 DNSBL:ATTRBL 521< 184.108.40.206 >_is_blocked.For assistance forward this email to firstname.lastname@example.org
Could you please Unblock us to continue with the future Mailing.
Domain : email@example.com
IP’s : 220.127.116.11
We are looking forward to hear from you.
11-19-2018 12:16 PM
So I've sent numerous emails to your block-list group to no avail, we are a small MSP company and you're really creating major disruptions for one of our customers. Their business needs to constantly communicate with recipients in the domain sbcglobal.net and you are blocking our mx from delivery. Since you are not responding to our inquiry for two weeks now I would like to request your support here. Apparently one of our DNS admins had made a mistake while setting the reverse zone, this was since corrected and all remediation measures have been completed.
12-12-2018 8:21 AM
I've sent multiple requests to the abuse_rbl account. I'm just not sure if they're being received.
We have a new, very important customer who uses ATT for email. We couldn't get through the rbl block, so I went through the trouble to set up a clean IP from AWS, from hosting, SPF, DKIM, rDNS. You name it. It is clean according to MXtoolbox as well. Once it went live we started receiving the same error for the new address.
What is the typical turn-around time for a delist request?
Thanks in advance.
host ff-ip4-mx-vip1.prodigy.net[18.104.22.168] said: 553
5.3.0 flph823 DNSBL:RBL 521< 22.214.171.124 >_is_blocked.For assistance
forward this email to firstname.lastname@example.org (in reply to MAIL FROM
Reporting-MTA: dns; css4.e5system.com
Arrival-Date: Wed, 12 Dec 2018 09:56:24 -0600 (CST)
Remote-MTA: dns; ff-ip4-mx-vip1.prodigy.net
Diagnostic-Code: smtp; 553 5.3.0 flph823 DNSBL:RBL 521< 126.96.36.199
12-12-2018 9:10 AM
03-12-2019 3:26 AM
we too face similar issue and there is no response from email@example.com. we are sending emails from Quislex.net. can some one help us releasing our IP's from ATTRBL.