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In order to not be marked as spam, you need to: <br>Make sure your reverse DNS is setup. ie, "mail.example.org resolves to 10.0.0.1, 10.0.0.1 reverse resolves to mail.example.org. (Or <anything.example.org>) <br>Setup a MX record that points to mail.example.org <br>Setup SPF records that allow only your MX record host to send mail <br>Setup DKIM. <br>Don’t send spam. <br> <br>(There should be tutorials on how to do each of things around, look at google, since you havn’t told us what MTA you’re using) <br> <br>
Check out <a href=“https://www.digitalocean.com/community/articles/how-to-use-an-spf-record-to-prevent-spoofing-improve-e-mail-reliability”>How To use an SPF Record to Prevent Spoofing & Improve E-mail Reliability</a>.