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I switched to fastmail from migadu last year. My killer feature is being able to use a custom email address per company without having to provision one (ie, a catch all that you can do send as x from).

I left migadu because they repeatedly demonstrated they were neither professional nor reliable enough to host my email (that is bargain basement pricing for you). I looked around and trialled several services on my other domains; I settled on fastmail as they had a proven track record with recommendations from people I trust who know email, every feature I wanted, and decent pricing.