I'll try the explain some more.
for example.
My domain exampledomain.com is hosten at hosting service Strato.
i added a TXT-record there, so that i could add my domain-name to the exchange service of my account.
so all my mail from example@exampledomain.com is saved in microsoft exchange.
Next i gonna move the hosting of the domain-name to another hosting service, Antagonist for example.
I have to add there the new TXT-record.
my question is, what happens with the mailboxes in exchange if they loose connection to the domain for a short while.
Will they be safe because they are linked to example@test .onmicrosoft.com ?
recap:
The microsoft subscription itself will not be changed or stopped.
The hosting of exampledomain.com changes.
The TXT-record will be unavailable for some time
All the mailboxes should be safe.
i hope this makes my problem a bit more clear.
Thanks!