If you must criticize or correct somebody over email, do not Reply All. Never. Even if there’s a small factual error that went out to a lot of people, reply just to the person who made the factual error and ask that person to Reply All. For praise on small things, I found that a quick Reply All email worked pretty well. This kind of praise takes only a moment, and it shows that you are noticing and appreciating what’s going on around you. If you can remember to mention it in person when you pass the person in the hallway or walk by their desk, so much the better. But don’t let perfection be the enemy of the good.
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