I think we’re all generally in favour of N email support, but the implications of supporting more than a single backup email are not immediately clear.
This is one of those arguments that is best resolved with code. Simply:
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Do a PR for 1 backup email, which you know will get accepted without much ado (and with much )
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then we can resume the topic of N emails. If need be, do some basic mockups of how this’d work in Discourse (GitHub seems to provide a good frame of reference) before submitting a PR that adds N emails support.