What to do, and not to do, with email

Some advice on using email wisely from author Jonathan Spira:

Don’t email someone, then immediately follow up with an Instant Message, a phone call and a tweet. it wastes your time and interrupts them, maybe while they’re trying to get you an answer.
Don’t combine multiple themes or requests in a single email. It’s too hard to pick out exactly what you want and if they store the information