No, because people have too damn many email addresses.
I typically have multiple email addresses at all times, with one constant (my gmail) and the others revolving around my employer, my school, and other affiliations. And which email I give you depends on how I know you (I'll give classmates and potential employers the university one, etc). So even though I might have someone's corporate address, if they change companies, I'm SOL. With this service, I can click your "request email" button, and you tell me the most convenient address to reach you at.
I typically have multiple email addresses at all times, with one constant (my gmail) and the others revolving around my employer, my school, and other affiliations. And which email I give you depends on how I know you (I'll give classmates and potential employers the university one, etc). So even though I might have someone's corporate address, if they change companies, I'm SOL. With this service, I can click your "request email" button, and you tell me the most convenient address to reach you at.