For the last couple of years I have been working on a multiple domain email management application. I did that because I had three email servers running on CentOS 7 and knew I would need to renew those servers eventually. They were using a very old Web-cyradm application I’d painfully transferred from CentOS 5, then CentOS 6, then to CentOS 7, so I set out to write a replacement app from scratch.
I completed the app and supporting software some months ago and have completed updating and transferring all three of my email servers to Rocky Linux 9. Just in time.
If interested see https://postadmin.net
Open source, MIT license.
Please accept my apologies if posting here was seriously inappropriate.
Emmett