How can we tell if someone is or not working for Zoho?

When I'm looking at different threads, I sometime see that people who answer have an employee tag next to their name.

But it is not always the case. How can we be sure that such people do work for Zoho if there is nothing that identify them as such?

Subsidiary question:
What are the official Zoho Support email addresses, where can we find them on Zoho's web site?

Thanks!

We are after all essentially irrational. — Spock