ZCS Administrator Guide 8.0

Open Source Edition

Message Store

All email messages are stored in MIME format in the Message Store, including the message body and file attachments.

The message store is located on each mailbox server under /opt/zimbra/store. Each mailbox has its own directory named after its internal VMware Zimbra Collaboration Server mailbox ID. Mailbox IDs are unique per server, not system-wide.

Messages with multiple recipients are stored as a single-copy on the message store. On UNIX systems, the mailbox directory for each user contains a hard link to the actual file.

When VMware Zimbra Collaboration Server is installed, one index volume and one message volume are configured on each mailbox server. Each mailbox is assigned to a permanent directory on the current index volume. When a new message is delivered or created, the message is saved in the current message volume.