INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Blocked

INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Blocked

I have recently began getting error messages from zoho servers stating certain emails are being blocked. After presenting this problem with zoho support they suggested it as an IP reputation problem. I am a student at a Community college, and the college is one of the places that is being blocked. Does anyone have a suggestion/s? Apparently I have a neutral reputation.