Comment by azernik

There are two different kinds of trust: trust that you're a legitimate person with good intentions, and trust that you're competent.

A university or corporate e-mail address helps with the former: even if the individual doesn't put their real name into their email address, the institution still maintains that mapping. The possibility of professional, legal, or social consequences attaching to your real-world identity (as is likely to happen here) is a generally-effective deterrent.