Are email X headers stripped by the server or forwarded?

Issue

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?



Solution

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