Verizon Media (previously known as OATH, previously known as Yahoo, previously known as AOL) has just launched their new Postmaster Site. Check it out!
As announced on their Postmaster Blog by Lead Postmaster Lili Crowley.
I think it's fair to assume that the legacy AOL Postmaster site is likely to shut down at some point in the near future. It brings a tear to my eye, as that site goes back quite a long time. Here it is in 2003, courtesy of the Internet Archive.