My mail server running on DigitalOcean has been relatively trouble free over the last 9 years. It runs docker-mailserver and is used by me and a dozen employees of my various small businesses.

It requires some effort to maintain and understand, and I’ve had a few deliverability issues over the years but they are generally with niche providers. I’ve never had trouble sending mail to the big providers.

Every time I read comments about the impracticality of self-hosted email, I scratch my head. Maybe I’ve just been lucky.