Choose a host that is not lax on spammers and guard your IP well. Don't use something with a fast moving shared IP pool like a vm. A dedicated server is best.
Do not bring your server up without securing the email setup and setting up essentially useless things like DKIM, SPF (and DMARC). Large providers want to see those.
If you get into a block list, know quickly and fix quickly.
Use a well established domain suffix like .com. The cheap vanity ones are usually blocked more.
If you need software recommendations, there is nothing Postfix+Dovecot cannot do.
Do not bring your server up without securing the email setup and setting up essentially useless things like DKIM, SPF (and DMARC). Large providers want to see those.
If you get into a block list, know quickly and fix quickly.
Use a well established domain suffix like .com. The cheap vanity ones are usually blocked more.
If you need software recommendations, there is nothing Postfix+Dovecot cannot do.