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OP, please deliver. It is super important to me that the original emails are preserved somewhere. Is this so?

Not OP, but to answer your question - yes, the original emails are preserved. More info: https://trysignal.com/using-signal/

So this implies that the emails would look unedited when accessed over IMAP?

Yes, the edits are only going to be visible on chrome for now but we are slowing progressing towards mobile.