The email address can be user-friendly, but card can also include an unique code similar to product serial numbers, that is redeemed with the first message. E.

The email address can be user-friendly, but card can also include an unique code similar to product serial numbers, that is redeemed with the first message. E.g. „Max Mustermann“ <ABCD-1234-XYZW|max@musterfirma.de> is a valid email address with unique code part.