A Low-Fi Solution to Email Overload: Sentenc.es

Every e-mail I send to anyone, regardless of subject or recipient, will be five sentences or less.  Ideally, it would be a 160 character count like an SMS message, but
since that would require an actual e-mail plug-in, we’ll
go with the much-easier-to-count concept of sentences instead.

[via ZenHabits]