As a corrolary to this, don't be negative (generally including criticism) in e-mail, and if an e-mail you get makes you angry/upset/frustrated simply wait a few

As a corrolary to this, don't be negative (generally including criticism) in e-mail, and if an e-mail you get makes you angry/upset/frustrated simply wait a few hours or a day or so before replying. I've found generally it's better to talk in person (or on the phone) first, then depending on how it goes, summarize in e-mail if necessary. Negativity in e-mail seems to come across particularly badly, and on top of that, it's easy to make assumptions (possibly without realizing you're doing it) and then type paragraphs of text based on an incorrect assumption. I've very much internalized the idea of "e-mail is where your keystrokes go to die" and am nearly convinced e-mail should be 100% banned for all internal communications (if it's actionable, create a ticket; if it's short-term discussion, use chat or have a meeting; if it's long-term information for archival, put it in a wiki/DMS).