Error Reason:554 5.1.8 Email Outgoing Blocked.

Error Reason:554 5.1.8 Email Outgoing Blocked.

Hi Zoho, 

It seems that my zoho email account  info@hailu.sg and its subsidiary alias accounts have been blocked since yesterday morning. 

This is a business email account, we would definitely need it to be recovered. Will you please help us to check the issue, and unblock the account


Thank you 
Best regards,