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Today I’ve recieved a Email with following Headers:

Arc-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none
Erhalten: from xxxxxxxx.protection.outlook.com

May I ask openly what this “protection” outlook.com server does in the absence of common spam and security features?

There are numerous tools in the web for (self-)checking. I usually provide this link and try to lead by example before going into further details like IP-Stripping, pentests or security:

https://mxtoolbox.com/domain/jakobssystems.net/

With this in mind,
stay healthy!

Tomas Jakobs