Fresh installation as internal mail server; I've configured an external pop3 account to be retrieved by Zimbra. Everything works fine, but I can't see the retrieved emails from pop3 account until I click on "Receive Email".

zimbra@mail:/$ zmprov gc default | grep zimbraFeatureMailPollingIntervalPreferenceEnabled
zimbraFeatureMailPollingIntervalPreferenceEnabled: TRUE

zimbra@mail:/$ zmprov gc default | grep zimbraDataSourceMinPollingInterval
zimbraDataSourceMinPollingInterval: 30s

zimbra@mail:/$ zmprov gc default | grep zimbraDataSourcePollingInterval
zimbraDataSourcePollingInterval: 1m