Status
What has to stay up
Reading and sending mail does not depend on us: it goes straight to your provider. The only thing that can fail on this side is activating a new licence.
Licence APIchecking…
Mail syncstraight to your provider
Licence check on the machinelocal, no network
If the API is down the app still opens and mail still arrives; what cannot be done is activating a new licence. A licence already activated works for thirty days without a connection.