Yesterday, Lifehacker US founder Gina suggested tagging your email as "sent from your mobile phone" to justify only writing a brief reply. The mild deception involved doesn't bother me, but I can't help thinking that there's nothing wrong with writing a brief reply no matter what your preferred platform is. We're all suffering from email overload, so keeping replies brief is a bigger courtesy than going on at length for form's sake. In a similar vein, I'm also a fan of the EOM tag for really brief messages. What do you think? Does email require lengthy replies, or is it acceptable to just get straight to the point with people you know?