diff --git a/src/freedombone-app-keyserver b/src/freedombone-app-keyserver
index d24ec8dc..40b3c206 100755
--- a/src/freedombone-app-keyserver
+++ b/src/freedombone-app-keyserver
@@ -390,6 +390,10 @@ function keyserver_sync {
                     echo "$other_keyserver_email" >> /etc/sks/mailsync
                     chown -Rc debian-sks: /etc/sks/mailsync
                 fi
+            else
+                dialog --title $"Sync with other keyserver" \
+                       --msgbox $"Email doesn't look right: $other_keyserver_email" 6 60
+                return
             fi
         fi
     fi