Have been with Fastmail since 2004. Their service is and has been fantastic, but this will be my last month with the service. I have moved my email domain over to iCloud+ and it’s worked out to be… OK. The biggest missing feature for me with iCloud+ is robust server side rules. It has them but not near as flexible as what Fastmail provides. I can live with it tho and it’s worth the $40/year savings.