Sometimes I think I'm done answering emails and then I get more emails in response to the emails I thought had sorted out the last of the questions anybody wanted to ask me. Also I get emails every time I buy a shirt.
Learn to answer questions clearly and concisely. ("Yawl: Same as a Cutter, but carrying a Mizzenmast well Aft.")
I take it as a matter of course now that whenever I purchase anything I have also committed myself to receiving friendly emails from the purveyor from now on, even if I haven't