I run my email server, but not at home. Running it at home is not all all more difficult, but it will only work for internal traffic and inbound from the internet. Residential IPs are simply blacklisted by ISP and as such - nothing will reach external recipients. Still useful, but is limited.

To have your smtp reach everyone globally you need to run it on a business IP. I use Linode, has worked very well since the setup in 2019, although they did get acquired by Akamai, which might become an issue at some point.