How to share full account (all folders) to another user in Zimbra mail
Zimbra supports sharing a full account, or all folders, from one user to another. The recipient can read and edit the shared account's data as if it were their own.
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How to share your email folders in Zimbra mail server
Zimbra mail lets email owners share email folders with other users. Shared users can have read-only access or permission to manage email in the folder, as specified by the folder owner.