ERROR_CODE :554, ERROR_CODE : 5.1.8 Sender Address Blocked

ERROR_CODE :554, ERROR_CODE : 5.1.8 Sender Address Blocked

Is there anyway to fix this from my side & from your side ?

This happened a few days ago for our main E-mail account associated to my account & you can check that

I have been used Zoho for 3 months and more without problem

The E-mail account shows blocked & can't be removed

I'm using Debian with Postfix mail server

Regards