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Most hosted mail services have no issues getting to mailbox. I've used Gandi, Mailbox, FastMail, and never have any mails flagged as spam.

Deliverability is only an issue when self hosting (particularly for home IPs)

I mean, at least for me it hasn't been a problem. I currently self host mail on a VPS and everything's awesome. YMMV

>never have any mails flagged as spam

You don't know this for certain, no one can unless you monitor both ends.