Zoho Mail stopped working, not incoming mail

Zoho Mail stopped working, not incoming mail

Zoho mail suddenly stopped working as soon as I purchased a license. I had been able to send and receive mail a few hours ago, and now I am no longer able to receive emails. Every test message sent does not arrive. No error on the sender's end. I am extremely frustrated by how often Zoho ceases to properly work. At a loss as to what to do, since I did not change any DNS records.