I'd run multi-master and then use a perdition setup on each machine such
that users only access one machine for their email. As all reads/writes
for one user happen on one machine you should avoid that problem.
If you have a failure then all users get pointed to the one machine and
everything keeps going.
In that case, does it also redirect smtp to the particular machine the user is on? The reason I ask is that it is possible for an email to be injected via smtp and imap at the same time. I'll definitely consider it as an option, if the setup is relatively simple then it's an option... If I have to specify which users are on which machine individually it could end up to be a nightmare.

Regards,
Josh.
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