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I would not include a post script in the body of an email because post means afterwards, so if inserted into the body, it's no longer "post". As one responder previously mentioned, a post script is...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/14694 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would not include a post script in the body of an email because _post_ means afterwards, so if inserted into the body, it's no longer "post". As one responder previously mentioned, a post script is an added thought, often of some short comment entirely different, or as a brief comment that contributes to what has been said, but gives a short insight or some other contribution to what has been written. I use post scripts in hand-written letters frequently, but since emails are generally shorter and more succinct, I have less need to use them in that format. I find that with emails, I insert additional thoughts in parenthesis or in between dashes just as in letter writing, but because of the shorter nature of my emails, I rarely use post scripts.