fix(GODT-2805): Ignore Contact Group Labels

internal/services/imapservice/helpers.go

@@ -133,7 +133,7 @@ func toIMAPMessage(message proton.MessageMetadata) imap.Message {
 
 func WantLabel(label proton.Label) bool {
 	if label.Type != proton.LabelTypeSystem {
-		return true
+		return label.Type != proton.LabelTypeContactGroup
 	}
 
 	// nolint:exhaustive

internal/services/imapservice/service_label_events.go

@@ -38,6 +38,10 @@ func (s *Service) HandleLabelEvents(ctx context.Context, events []proton.LabelEv
 	for _, event := range events {
 		switch event.Action {
 		case proton.EventCreate:
+			if !WantLabel(event.Label) {
+				continue
+			}
+
 			updates := onLabelCreated(ctx, s, event)
 
 			if err := waitOnIMAPUpdates(ctx, updates); err != nil {
@@ -45,6 +49,10 @@ func (s *Service) HandleLabelEvents(ctx context.Context, events []proton.LabelEv
 			}
 
 		case proton.EventUpdateFlags, proton.EventUpdate:
+			if !WantLabel(event.Label) {
+				continue
+			}
+
 			updates, err := onLabelUpdated(ctx, s, event)
 			if err != nil {
 				return fmt.Errorf("failed to handle update label event: %w", err)

internal/services/imapservice/sync_update_applier.go

@@ -191,7 +191,8 @@ func syncLabels(ctx context.Context, labels map[string]proton.Label, connectors
 			}
 
 		default:
-			return nil, fmt.Errorf("unknown label type: %d", label.Type)
+			logrus.Errorf("Unknown label type: %d", label.Type)
+			continue
 		}
 	}