Dovecot can support mailbox sharing in several different ways:
- Sharing mailboxes in a one backend setup:
- Sharing mailboxes when running multiple backends:
Shared Mailboxes in Dovecot Cluster: When there is more than one Dovecot backend, sharing must be done via imapc.
See Filesystem permissions (in shared mailboxes) for common filesystem related permission problem. Note that these permissions only make sense when using a shared filesystem to enable sharing between users.