Hi boB, I wrote up a blog post a while back on dealing with multiple inboxes in Mutt (in fact, I'm writing this from Mutt and sending it through ProtonMail, so it *is* possible!): https://chiraag.me/blog/2019/08/21/managing-multiple-email-accounts-with-mutt-and-fetchmail/
My setup involves two moving parts (mutt and fetchmail+getmail_maildir), but I have never run into this issue. However, because fetchmail uses the unread status as a flag of which emails to fetch, all downloaded emails are marked as 'read' on the server, which can make things a bit annoying. Possibly another mail retrieval agent (like getmail, for example) would solve that issue. HTH! - Chiraag -- ಚಿರಾಗ್ ನಟರಾಜ್ Pronouns: he/him/his
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