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Version: 1.6.0 - I think. It did an update and is running the latest as of Aug 22
Linux 20.0.4
Apache
Download installer.

When installed a while ago I set the default domain to be xzy.com.
At the end of Sept, the domain will be turned off,  which means postmaster and whatever esle
hangs of the domain will no longer have an active domain.
The domain will be marked as disabled.
Change I and if so how to change things that need to be changed to the new domain of abc.com ?
I guess I whould also ask what needs to change.  Its only extra part is roundcube.

Any pointers or clues / docs etc would be greatly apreciated.
Thank you