Just another data point: I've been running my own mail for more than 6 years and I've never had a problem with receivers. Hosted on a cheap Strato VServer in G

Just another data point: I've been running my own mail for more than 6 years and I've never had a problem with receivers. Hosted on a cheap Strato VServer in Germany, I've never cared for the technical details, could not explain right now what DKIM and SPF are (and they're not configured), and only recently installed a self-signed SSL certificate in my Exim configuration to be able to use it with a Desktop client for submission (pretty sure outbound traffic still runs unencrypted).