Unable to send or receive messages; (Reason:554 5.1.8 Email Outgoing Blocked.)

Unable to send or receive messages; (Reason:554 5.1.8 Email Outgoing Blocked.)

Hi Support,

I am unable to send or receive emails on my Zoho mail (suneel @montessoritraining.in). My Inbox was full and hence it was blocked. I have cleared the emails now and its at 45% usage now. However, my outgoing and incoming emails are still blocked.

Please suggest a fix.

Regards,
Suneel