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When replying to received emails, Mail’s behavior can be set up to include the previous conversations on your reply mail. There are times when you don’t necessarily need to include them all in your reply. Sometimes just highlighting an important bit of text you want will be sufficient for further discussion.
So for example, let's say a friend of yours sends you the page contents of a location you both are eyeing for a vacation spot. You get this long email about the geographic location, history, and many other things, and you find something interesting to reply about.
In this case, you don’t need to append the whole entirety of the initial email that was sent to you. On the reading pane, highlight the text you want to discuss further. Once done, click the reply button in mail to compose your reply, and the long email previously sent will not be included, instead, only the highlighted text will be included on your reply.
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This method helps you weed out all the other information you will no longer be needing as you go ahead and discuss further plans, or points of a meeting, or reiteration of important information that you need to go over.