XF 2.2 Emails adding "delivery." subdomain


An user of my forum warned about a security alert from his anti-virus when trying to open a notification email. Seems like the emails add the "delivery" prefix (delivery.mydomain.com...) to the urls.

Is this a XenForo configuration? The url opens normally, but I have no idea why this was added, not sure if this is how it should work and if it's necessary to configure this subdomain on the server.
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