

Been self hosting email for a good while now and it’s been largely painless. My emails are not getting marked spam either. Although my only outgoing mails are to FOSS mailing lists and occasionally to individuals, not for anything business related.
I would say that if self hosting email sounds like something you’d be interested in, then it probably is worthwhile for you. I like being able to configure my mail server exactly the way I want it, and I have some server side scripts I wrote for server side mail processing, which is useful as I have several different mail clients so it makes sense to do processing on the server rather than trying to configure it on my many clients. It definitely falls into the “poweruser” category of activities but I’ve had fun and I enjoy my digital sovereignty.
You get a domain name, and use an A record to point it towards your server’s public IP address.
You tell nginx to forward requests to a given domain. For instance, you could tell nginx to forward requests to foo.bar.com to 127.0.0.1:1337. To do this:
Note that this is a very basic setup that doesn’t have HTTPS or anything. If you want an SSL certificate, look into Let’s Encrypt and Certbot.
Also, the service you’re hosting (which I’m not familiar with) may have an example reverse proxy config you should use as a starting point if it exists.