> unless, of course, you don't know said engineer because you don't even work in the same company...

Or they work in a different part of the fairly-large company that you both work for.

I guess emmelaich either missed the part of my commentary where I talked about handling inter-organization communication, and/or has never worked at a company where it's simply impossible to know everyone who could reasonably be relevant to the stuff that the company works on.