Is IMSS policy service able to work if LDAP is not up and running?

Yes, the policy service still works even if the LDAP server is not up and running.

For example:

IMSS continues to work as usual.
- If the LDAP server is active but the port of the LDAP server is inaccessible.
- If the policy server has the non-expired cache of the LDAP user or group.
IMSS spends about one minute to perform each rule query. The policy server will bypass the LDAP-related rules and continue to process other rules. This may slow down message scanning and result in long mail queues.
- If the LDAP server is not running or the port of the LDAP server is inaccessible.

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