I've been made aware that people attempting to email me are receiving the following message:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain amoss.co.uk by mx.zohomail.com. [74.201.154.201].
The error that the other server returned was:
554 5.2.3 MailPolicy violation Error delivering to mailboxes
Can you please advise as to what I need to do to resolve this please?