I've always wondered why we don't use that as our subject for all sorts of business needs. I'm talking about normal employee-to-employee business in addition to more technical things like security groups and so forth. Don't email Karen, email [whatever her role is], at least for official requests pertaining explicitly to defined job responsibilities.

That way the sender doesn't get delayed by unknown turnover, and the new recipient has full history to look back upon instead of starting cold.