Using email as method of introducing two (or more) people. This is typically done to (1) introduce people who in lieu of a formal meeting, and (2) do so in a manner that encourages the two parties to begin dialogue without the facilitating need of the originator.
Since Christina won’t be involved from this point forward, she’ll just emtroduce Andrew and Karen so they can set up a time for kicking off the project.
Introduction to someone via an online medium such as email, instant message or forum post. These sorts of introductions are often less personal but socially acceptable in more technology friendly circles such as online gaming, web services or eMarketing.
The etroduction of Robert to Anthony was well-received even though it could not involve a formal handshake.