There are no magical DNS records you can configure to prevent your messages from being marked as spam. Otherwise, all the spammers would be doing that, which would void the purpose of a spam filter.
If your emails are being marked as spam, a good place to start is to send an email to https://www.mail-tester.com/. They will calculate a spam score for your email and give you a breakdown of why that score is given.
If mail-tester.com says your email is OK but it still ends up in the spam folder, please contact the provider of the receiving email address. After all, it’s their email address marking your messages as spam, so they should be able to tell you why that happens.