True, some people use a different address for each service (ie. yourservice@mydomain.com), and they tend to be the the kind of people one would want to hire as

True, some people use a different address for each service (ie. yourservice@mydomain.com), and they tend to be the the kind of people one would want to hire as engineers! I wonder if Sourcing.io figured it out somehow, but at least compared to option 1 it seems better to look them up manually.