is a good medical industry email guideline. Though I was surprised to see that the author missed quoting 42 CRF in the signature.
"Not having any email retention policies inevitably will result in amassing vast volumes of communications that are costly to retain, even more expensive to search through in response to discovery requests, and may unwittingly supply information that is harmful to the organization if disclosed in response to discovery requests."
the article goes on to point of the other end of the extreme of deleting all email.
A medical practice should have thought about and implemented polices that resulted in a course of practice and action that limits the liability of the individual as well as the organization. Compliance with all laws, accreditation/licensing organization [JACHO/CARF] rules along with State requirements all come into play in the creation.
In other words just because its not demanded/a law that says you have to retain email doesn't mean its not in your best interest to keep some for a limited amount of time. Objective is to find the balance that works for you.
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