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What happens to incoming mail when the firmware on a Email Security Gateway is updated during business hours?

  • Type: Knowledgebase
  • Date changed: one year ago
Solution #00001489

Scope:
This solution applies to all Email Security Gateways.

Answer:
During a firmware update, the Email Security Gateway will undergo a quick reboot.

During this time, the MTA (Mail Transfer Agent) will be restarted. If the MTA is not listening on port 25, a connecting server would receive a "Connection Refused". As a result, they would retry at their next scheduled retry interval (this is an independent value based on the sending server's configuration).

Additional Notes:
To control this process a little more, you could go to the Basic > Administration page and take the box offline (by clicking the Offline button) prior to upgrading the firmware. This will:
  1. Help make sure mail does not get lost.
  2. Speed up the upgrade process.
After the box reboots, once the firmware has been upgraded, go back to the Basic > Administration page and bring the box back online (by clicking the Online button).

Link to This Page:
https://campus.barracuda.com/solution/50160000000GSg6AAG