I’ll have to try it out, but my assumption is that quite a few people will try to reply. It might be nice to have one or more of these options:
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Don’t send mail even if someone is watching this category. Possibly give them a notification (or a one-time message) saying that if they want email delivery of this list, they should {do whatever steps it takes to sign up for the list directly}.
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Let the site admin define the reply-to address when mail is sent from a mailing-list-mirror category. (On a per category basis, of course.) Then, users could subscribe to that list without delivery enabled, get notifications from Discourse, and if they reply, that reply would actually go to the original list.
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A “divert replies to category” option, where when someone replies, a linked topic is created in a different category. For example, category Announce List is a mailing list mirror, and then Discussion About The Announcements for replies. The title needs some workshopping.