Mail not working. Oops! an error occured. Zohomail loads but cannot access emails.

Mail not working. Oops! an error occured. Zohomail loads but cannot access emails.

This is frustrating.

I have tried different browsers and computers but emails are not loading. I can sometimes see the headers but not the emails. I only see 'Oops!An error has occurred. Retry'.

The phone app appears to load and send emails but does not receive them.