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Pretty much any IMAP mail provider combined with Nextcloud for sync will work.
Keep in mind too that Proton Mail has a commercial offering that should work with thunderbird. I have no experience with it.
We use our ISPs mail with our Nextcloud instance but long run will probably move to domain mail with maybe Fastmail for the mail component. Not sure yet. I will be interested in what you find.
I wonder to what sort of standard. I know I was shocked how poor things were when I started grading college students work as a TA. Same later in the work world reviewing nominations for an award.