emtroduce
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.