resume method
Resumes the mail client after a some inactivity.
Reconnects the mail client in the background, if necessary.
Implementation
Future<void> resume() async {
try {
if (isPolling()) {
await stopPolling();
await startPolling();
} else {
await _incomingMailClient.noop();
}
} catch (e, s) {
print('error while resuming: $e $s');
// the re-connection should be triggered automatically
}
}