[Dovecot] prevent dovecot from modifying maildirs

Hi all,

Is there any possibility to ask dovecot to write nothing to disk, something like a "read only" state, without shutting it down? I have set up a ZFS+postfix+dovecot mail server, and I need both postfix (postsuper -h ALL) and dovecot (¿?) to stop modifying the disk to create the snapshot to be saved.

Does anybody has any idea on how to achieve this?

Regards!
Felix