fix_: wait for mailserver available signal to change missing messages criteria (#5686)

protocol/messenger_mailserver.go

@@ -396,11 +396,17 @@ func (m *Messenger) checkForMissingMessagesLoop() {
 	t := time.NewTicker(missingMessageCheckPeriod)
 	defer t.Stop()
 
+	mailserverAvailableSignal := m.SubscribeMailserverAvailable()
+
 	for {
 		select {
 		case <-m.quit:
 			return
 
+		// Wait for mailserver available, also triggered on mailserver change
+		case <-mailserverAvailableSignal:
+			mailserverAvailableSignal = m.SubscribeMailserverAvailable()
+
 		case <-t.C:
 
 		}