When you get something done, just respond with: "done.", quickly.
Somebody ask you to fix something small?, do it now, respond quickly. Somebody waiting for an invoice to get paid?, don't pay it and make them check the bank statement, just tell them it's done. Somebody ask you to configure something, do it, confirm with: "done.".
This is different to responding to every email with a "Thank You", that's pretty pointless.
Get shit done, close the loop, move on. Don't send extra fluff.
Part of my series on Strong Opinions.