Error, ERROR_CODE :552, ERROR_CODE :5.2.0 vxmd1p02i3M4vqa01xmfhV Suspected spam message rejected. IB703

Error, ERROR_CODE :552, ERROR_CODE :5.2.0 vxmd1p02i3M4vqa01xmfhV Suspected spam message rejected. IB703

Hello Everyone,

I have been mailing with one of my client for a while. After I replied his mail today, I got a mail says;

Error, ERROR_CODE :552, ERROR_CODE :5.2.0 vxmd1p02i3M4vqa01xmfhV Suspected spam message rejected. IB703

Could you please help?

Erkan