This is to inform you that we are not using zoho mail facility to send campaigns. My outgoing mails has been blocked with error 554 5.1.8. Request you to kindly Unblock my email ASAP, this is hampering my work a lot. We are a IT company and send around 60-80 Conversational Mails per day.  

Kindly do the the needful at the earliest.

Regards 

Appy