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Port 7306Zimbra 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..

inEmailDatabases
transport
tcp

single transport

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
6,983

rank 732 of 993 · top 74%

Technical Details

what runs on :7306

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.

Security Information

exposure of :7306

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

email averages 3.9 across 42 ports — this one sits 0.1 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

unofficial

used by convention, not registered — what answers here varies by deployment

reachable over

tcp

every listening transport is another surface to filter at the edge

security overview

Common Vulnerabilities:

  • Unauthorized internal access leading to data breaches if internal segmentation fails
  • Exploitation of unpatched vulnerabilities in MySQL or Zimbra components
  • Potential privilege escalation through weak database authentication
  • Insider threats exploiting internal knowledge of port use

Common Mitigations:

  • Employ strict internal network segmentation and firewall rules to prevent unauthorized lateral movement
  • Use strong, unique credentials and monitor for unauthorized access attempts
  • Keep MySQL and Zimbra components regularly updated with the latest security patches
  • Enable logging and auditing to monitor database interactions and detect anomalies
  • Where feasible, encrypt database traffic or use secure tunnels to prevent interception within the internal network

Related Ports

all 42 in email →

the 8 most looked-up other ports in email — 42 ports carry that label.

portservicerisk
:143IMAPcaution
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:109POP2caution
:2096cPanel SSL Webmailsafe
:110POP3caution
:993IMAPScaution
:1352Lotus Notes RPCcaution
:24Private Mailcaution

risk mix of the 8 listed

  • safe13%
  • caution88%

3 of 8 encrypted