Designer Mike Davidson says many email messages he receives take more time for him to answer than they did for the sender to write. So he’s instituted a new email policy: no message he sends out will be more than 5 sentences.
In order to politely explain the systematic brevity with a similar amount of brevity, I will link to a new site I just set up called five.sentenc.es in my signature line. By ensuring that all e-mails I send out take the same amount of time to send (viz. “not a lot”), I am evening the playing field between emails and attending to many more of them in the end.
Brevity is a great thing, and I love this idea, but you could probably implement it without the five.sentenc.es signature. After awhile, others will just expect short responses from you.