Comment by proton_9

I got to know about this when i was setting up my email server, I have never sent emails to people i don't personally know and yet a few did land in spam and i had to ask them to mark it as not spam, that did help with improving the reputation, i also signed up on google postmaster also outlook as well i think. It's a actually a pretty easy thing to setup your own email server, i wrote about it, not the explicit details but the jist of it. https://tech.yaker.in/posts/self-hosted-e-mail-stack