> But running it is different issue. Notably, I have no idea, and have not seen a resource talking about troubleshooting and problem solving for a self hosted service. Particularly in regards with interoperability with other providers.
It's nearly impossible to get 100% email deliverability if you self host and don't use a SMTP relay. It might work if all your contacts are with a major provider like google, but otherwise you'll get 97% deliverability but then that one person using sbcglobal/att won't ever get your email for a 4 week period or that company using barracuda puts your email in a black hole. You put in effort to get your email server whitelisted but many email providers don't respond or only give you a temporary fix.
However, you can still self host most of the email stack, including most importantly storage of your email, by using an SMTP relay, like AWS, postmark, or mailgun. It's quick and easy to switch SMTP relays if the one you're using doesn't work out. In postfix you can choose to use a relay only for certain domains.
It's nearly impossible to get 100% email deliverability if you self host and don't use a SMTP relay. It might work if all your contacts are with a major provider like google, but otherwise you'll get 97% deliverability but then that one person using sbcglobal/att won't ever get your email for a 4 week period or that company using barracuda puts your email in a black hole. You put in effort to get your email server whitelisted but many email providers don't respond or only give you a temporary fix.
However, you can still self host most of the email stack, including most importantly storage of your email, by using an SMTP relay, like AWS, postmark, or mailgun. It's quick and easy to switch SMTP relays if the one you're using doesn't work out. In postfix you can choose to use a relay only for certain domains.