"Well, yeah, I know, but Ginette called me first. And you know our policy requiring the code for the day before sending customer information...," I’d bluff. If the person objected, I’d say I couldn’t send the information. And I’d continue with something like, "In fact, please let Ginette know I couldn’t send her what she needed because you wouldn’t verify the code. Also, please let her know that I’ll be out of the office until next week and we can discuss it when I get back." That was usually enough to push the holdout over the edge, because no one would want to undermine a coworker’s request.