[all2]

I assume that business cards would have a unique email/end point to allow for this case, kind of like how gmail and others allow you to add +<stuff> to the end of your email address. So you'd have a set of "business card" emails + rules that would allow only the first sender to send emails to that address (for example).

[mminer237]

So each business card would have to be unique with a unique address? I feel like it is generally considered unprofessional to have an email address with random letters in it, not to mention, you'd need a special business card printer to handle that.

[ivan_gammel]

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|[e-mail]> is a valid email address with unique code part.

[gcanyon]

I think yes, this would be required. An email address with random characters in it for no reason would certainly be questionable, but if the use case I'm proposing becomes at all known it would be much more understandable I think.

[jrky]

>So you'd have a set of "business card" emails + rules that would allow only the first sender to send emails to that address (for example).

Simple but genius! I love it :-)

[gcanyon]

Yep -- I wasn't thinking of business cards for this, but something like this would be required I think.