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RBL IP Unblock / Delist request
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:
553 5.3.0 flpd579 DNSBL:ATTRBL 521< 18.104.22.168 >_is_blocked.For
assistance forward this email to firstname.lastname@example.org (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 email@example.com 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.