dovecot: Add shared mailbox for the mediation team
Please see [1] and [2] for a better understanding of how this works.
[1] https://doc.dovecot.org/configuration_manual/authentication/password_databases_passdb/ [2] https://doc.dovecot.org/configuration_manual/authentication/user_databases_userdb/
Fix #464 (closed)
Edited by Kristian Klausen