Most of what lands wrong today gets its edge from you before it gets one from anyone else. A short reply reads cool, a kind gesture reads calculated, a finished sentence reads unfinished, and in each case you're the one adding the second layer. The old arrangements hold on their own. When the afternoon empties out after three-thirty, treat it as time to close and tidy, and keep any first-time send until tomorrow. Whatever coolness you find in someone's message today, you'll have written most of it yourself.