It's only opt-in for the end user. If it were really opt-in, it would be opt-in for the domain owners and/or the email providers. Come to think of it, I wouldn'

It's only opt-in for the end user. If it were really opt-in, it would be opt-in for the domain owners and/or the email providers. Come to think of it, I wouldn't have an issue with this, and it might be worth it for recruiters who use LinkedIn for everything (and in my opinion are doing it wrong).