I got one self-hosted setup: Postfix, dovecot, both IPv4 and IPv6. It has been working for 15+ years and is still going strong. Never had any major deliverability issues.
In my new company we are using Gmail though. Easier to manage for non-tech people and it’s fully managed.
In my new company we are using Gmail though. Easier to manage for non-tech people and it’s fully managed.