Kindly help me out with this strange problem. I tried using a mail merge option a few days back from my outlook configured to my Zoho account. A few minutes in I figured out that my zoho account got blocked. 

As a next step I logged on to my webmail and unblocked my zoho account. Since then, I am not even able to send out even a single email from my outlook tool. 

I have already reconfigured my zoho account multiple times but the same issue. 

Any emails sent out from my webmail zoho account are facing no issues. 

Please help.