100% agreed. I try to treat email as any other letter I recieve(1). Meaning that the sender can only expect an instant reply if I know beforehand the mail is c

100% agreed. I try to treat email as any other letter I recieve(1). Meaning that the sender can only expect an instant reply if I know beforehand the mail is coming and urgent. The same way one would rapidly reply to an urgent letter one is expecting, but easily take a day or more to reply to, or even open, a non urgent letter. If you need to get a hold of someone directly you should use your phone (to call them). If they don't pick up their phone, leave a voicemail or send an sms. (1) Registration confirmations / new password emails are an obvious exception here.