How can I find an unknown email address?

Answer 1

By asking the person it belongs to what it is.

There is no general method for finding anyone's email address ... if they don't make it public and you don't know someone who knows it, you're probably not going to have much luck.

Some companies and educational institutions use a standardized format for email addresses, so that if you know that "John Smith" works for "example.com" and you know their standardized format, you may be able to make a pretty good guess that it's probably johnsmith@example.com or smithj@example.com or something like that. But in general, if you don't know someone well enough to contact them in some other way. there's no way to find out what their email address is.