This. I self-hosted from the mid-90s until giving up in 2017. My outgoing email was increasingly black-holed by major email providers. I eventually accepted that I would either have to give up on email or pay for hosting. At some level this feels like paying protection money, but there are a lot of things about the internet that don't match up very well with 90s idealism.

I haven't had any issues that I've noticed. Sending to gmail for example is issue free. Maybe I am lucky?