Your message couldn't be delivered because you weren't recognized as a valid sender. The most common reason for this is that your email address is suspected ...
Delivery has failed to these recipients or groups. All my incoming emails are going directly to the deleted items folder, and I keep receiving this ...
Send a email ( outlook calendar ) to few group(min 5groups).
Three days ago there were ~360 messages from "Microsoft Outlook" all Undeliverable but with pornagraphic headings, now there are just ...
Delivery has failed to these recipients or groups: I have been receiving
The delivery has failed to these recipients or groups error in Outlook /Exchange can occur if the user account is blocked for suspected spam or if ...
Delivery has failed to these recipients or groups:
When an external sender attempts to send an email message to an Office 365 group they may receive a non-delivery report with status code ...
Delivery has failed to these recipients or groups.
(In Outlook, choose off for Reading Pane, then we can see the size of this mail)