I have been self hosting my emails for many years on cheap dedicated servers (previously kimsufi by OVH and now Hetzner). Never had any issues with sending mai

I have been self hosting my emails for many years on cheap dedicated servers (previously kimsufi by OVH and now Hetzner). Never had any issues with sending mail. But I've been careful with the initial setup and have all the expected requirements covered : no open relay, SPF, DKIM, reverse ip, TLS,... Been using the tutorial at workaround.org as basis for building the stack (postfix, dovecot, rspamd,...) and, while the initial learning curve was high, once its been set up, its been a really very stable setup requiring practically no maintenance whatsoever. Not saying that's for everyone, just saying it works for me. I guess I was lucky at the dice roll mentioned by other comments. Ah yeah, and testing your outgoing emails using a service like mail-tester.com is very very useful. I aimed for and reached a perfect score 10/10.