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Infomaniak (swiss) has a decent deal of a couple of free mailboxes with any domain you own through them. The webmail client kinda sucks but I just sync it with native clients. Using username:password for SMTP feels pretty weak tho they don't have Oauth2 support. lol now I'm talking myself out of it but it's worked great for years.
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Fastmail has been working well for me.
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Run your own server. Very easy with something like Mailinabox. You might need to find a relay for outgoing mail.
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I am on protonmail+ my own domain. Works alright
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I'm really looking forward to Thundermail.
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