We changed IP addresses on Saturday to a new-to-us block that we have purchased.
Unfortunately the IP address being used by our outbound mail server is on the ATT RBL. It does not seem to be on any other blacklists.
I reported this to firstname.lastname@example.org which generated an automatic reply. In the reply it said that if there had been no change after 48 hours to send a follow up email to email@example.com. It also references the web page https://www.att.com/esupport/postmaster/. The web page then refers me back to sending an email to firstname.lastname@example.org. This feels like a black hole. It has been over 72 hours.
How do we get off the blacklist?