i find if you do a centos 8 install, then migrate to OLS and then try and add the mail server app there is a few initializing stuff that isnt happening like the no vmail user for starters and port 25 is blocked notice even though it isnt and the only firewall is ufw and yes firewalld was manually removed, also python errors.
But if i do a centos fresh install, install aapanel, install the mail app, then do a migration, its appears fine - i can then remove the mail app and add it again just fine.
I would like to see the focus shift from centos stream to oracle linux but im only a user and do not know what their (read: Oracle) end game is with the rhel 8.3 or whether they pull some shifty down the line too (like redhat did with centos) but it seems like common sense and legit to support it at the moment?