Your message wasn’t delivered because the recipient’s email provider rejected it

Your message wasn’t delivered because the recipient’s email provider rejected it.

I was helping a client with a new 365 Exchange mailbox setup and the email would not deliver. All the DNS records were correct so it was driving me mad trying to figure out what was wrong. I got the error when sending from online or on in Outlook desktop. I logged into their account on browser on my pc and it sent just fine. Culprit had to be Norton. I disabled Norton and both online and Outlook delivered the email just fine.

So that was that, Norton was removed and client was disappointed and happy at the same time.

Tags: Delivery has failed to these recipients or groups, Your message wasn't delivered because the recipient's email provider rejected it.

Category: Outlook Support