Email Etiquette
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Email etiquette is about something more than being polite. The right way to handle email is to always give and demand a prompt response - not only when the job has been done or the question can be answered, but simply to acknowledge that the message is received and the task will be attended to. If you can't give a sender the information they need at the moment you receive their request, let them know when they can expect an answer from you. Do this yourself, and expect the same thing from other people. Hold people accountable, and while they may not change their habits with anyone else, they will at least change the way they behave with you.