10. Don’t leave out the message thread.
When you reply to an email, you must include the original mail in your reply, in other words click ‘Reply’, instead of ‘New Mail’. Some people say that you must remove the previous message since this has already been sent and is therefore unnecessary. However, I could not agree less. If you receive many emails you obviously cannot remember each individual email. This means that a ‘threadless email’ will not provide enough information and you will have to spend a frustratingly long time to find out the context of the email in order to deal with it. Leaving the thread might take a fraction longer in download time, but it will save the recipient much more time and frustration in looking for the related emails in their inbox!
- See more at: http://blogs.universal.org/cristianecardoso/en/19-most-important-email-etiquette-tips/#sthash.7hJhX9rc.dpuf