When creating suppression lists, the facility exists to create additional columns, beyond email, but this is not a functional consideration; the additional field(s) do nothing.

WCA allows us to create restricted databases with multiple keys, which allows shared emails to be recognised, however if one contact unsubscribes, the email address is added to the suppression list, meaning neither contact will receive further correspondence.

It would be useful if the suppression lists would allow composite keys to be recognised so that only