Emails are sent to our Gmail account and then picked up by Zoho. Yesterday we started getting the following:

Delivery to the following recipient failed permanently:

Technical details of permanent failure: 
Google tried to deliver your message, but it was rejected by the server for the recipient domain ...  by  zm-apps.zoho.com . [204.141.32.122].

The error that the other server returned was:
541 5.4.1 Mail rejected by destination domain

Emails no-longer seem to make it through to Zoho - Please can you sort this out?

Thanks

Dave