Can someone tell me why I have two messages in my inbox, but it shows six?
You have the Inbox Categories feature enabled, so it is likely that the other emails are in the Other (Weitere) tab.
If you want to learn more about the Categories feature, what it’s for or even how to customize it, you can read this article on our website:
If you’d prefer to turn this feature off, you can do so in Settings > Mail > Categories, uncheck “Show categories”.