Are email X headers stripped by the server or forwarded?


This Content is from SuperUser. Question asked by FluidCode

I am a privacy freak and I use a lot email aliases. I never sent my true email address to many online businesses and organisations and I try to keep the different identities well separated. But some time ago I started using Kmail as my email client until I found out that it automatically adds to the email a X header with the primary identity. So if I send an email from an alias it adds:
X-Kmail-transport-name: {$SERVICE_PROVIDER} ({$REAL_EMAIL_ACCOUNT})

Are the X headers going to be stripped by the email server before sending the email to the destination or will they be forwarded? Was my real email account leaked to the receiver?


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