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Zimbra MySQL Mailbox
Port 7306 is primarily used within Zimbra Collaboration Suite to facilitate database communication between mailbox servers and their associated MySQL backend. As an internal service port, it enables critical storage and retrieval operations essential for email and collaboration functionalities. The port typically listens for connections from Zimbra components, rather than external clients..
Zimbra Collaboration Suite (ZCS) leverages a MySQL database backend to manage mailbox data, user information, and system configuration. Port 7306 traditionally serves as the communication endpoint for ZCS mailbox servers interacting with the MySQL instance that stores and retrieves this vital data. This internal service ensures smooth operation of features such as email storage, search indexing, calendar management, and account management within the Zimbra ecosystem.
Unlike standard MySQL ports (typically 3306), port 7306 is custom-configured to reduce exposure and conflicts. It is generally used in a securely segmented environment within Zimbra’s infrastructure, facilitating traffic between mailboxes and internal data stores rather than providing a public-facing database service. This reduces the port’s exposure but requires proper internal security controls.
From an operational perspective, the communication over port 7306 is critical for the health and availability of the Zimbra Collaboration Suite. Downtime or disruption correlates directly with loss of core email services or data integrity issues, underscoring the importance of securing this port and ensuring its availability.