I am trying to reply to an email but keep getting the following message. What do I need to do to resolve this? I am sending from a google apps for business account.
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 his _domain.co.uk by his _domain.co.uk. [220.127.116.11].
The error that the other server returned was:
550-Verification failed for <ed@my_domain.co.uk>
550-No Such User Here
550 Sender verify failed