Marketing email flagged as "caution spoofing"

I recently sent an email through the marketing email function. When it comes through, our IT software labeled it this way. Our system may be turned up very high, and I'm not sure it was labeled this way for every recipient. It had two embedded graphics and text, no CTA button, and came from my personal work email. That being said, has anyone run into this and found some best practices to avoid email getting quarantined or blacklisted by systems? Thanks for any advice!