I sorta self host my email. Technically aws hosts my email but I've a local postfix and dovecot to serve devices.
That simplifies ip address reputation, dkim, spf, etc. It also provides a backstop if my homelab goes down as messages buffer to s3. I pay a few cents per 1k messages, which effectively means zero.
Hello I'm a 12 year Microsoft MVP and Certified independent advisor here to help.
Please type "CMD" into the start menu then type "ckdsk /f /r"
If this solved your issue please click on "Accept as solution"!