Concepts And Flow

FortiMail high availability modes

FortiMail units can be configured to operate in high availability (HA) clusters. FortiMail HA has two modes: active-passive and config-only.

  • Active-passive HA: Two FortiMail units operate as an HA cluster, synchronizing both configuration and data, providing failover protection.
  • Config-only HA: Up to 25 FortiMail units use an identical configuration, but do not synchronize data, and therefore operate as independent FortiMail units.

Fortinet recommends HA to achieve uninterrupted service.

For more information on HA, see “Using high availability (HA)” on page 305.

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