The contest is: I have emailed a colleague (A) for some information about a project. Since he left the company he provided me the email address of the new colleague (B) I have to email. When I email to B may I say, "I was forwarder to you by A" or "A forwarded to you"?
I think what you're looking for is:
"I was referred to you by A"
You can forward an email, not a person. You were referred to B by A.
Also, I don't think this meets the technical definition of a "forwarded" email. Usually, when you "forward", it means that you're passing along an email that you received. If you compose the email and send it to another person (as A did), you're simply sending the email, not forwarding it, per my understanding of how the verb "forward" is used in modern parlance.