Regarding Mailservers

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. Read more