Check the email addresses, subject line, and date, and run the checks again.
If that doesn't work, contact the sender and ask if they received an email that indicates why the message wasn't delivered (non-delivery report). The problem seems to be happening before the message comes to the Office 365 mail servers.
Tip: If the sender is trying to send messages through a multifunction printer or line-of-business application, the following article guides you through the process for doing that.
How to set up a multifunction device or application to send email using Office 365
Check out your personalized feed of relevant documents. What you see is based on what you and your colleagues are working ...
Check the box next to each account you want to remove. Once the account is removed, the external user won't be able to access ...
Check the email address, and run the checks again. If you entered the correct email address, you need to either create a ...
Check the email address, and run the checks again. If you entered the correct email address, you need to either create a ...
Check the email addresses, subject line, and date, and run the checks again. If that doesn't work, contact the sender and ...
Check the email addresses, subject line, and date, and run the checks again. If that doesn't work, contact the sender and ...
Check the email addresses, subject line, and date, and run the checks again. If that doesn't work, contact the sender and ...
Check the email addresses, subject line, and date, and then click Back to run the checks again. If that doesn't work, contact ...
Check the Message Events table below for any additional information about why message delivery might be delayed. For example, ...