Double-check the email addresses, subject line, and date, and click Back to run the checks again. If that doesn't work, contact ...

Office 365

Double-check the email addresses, subject line, and date, and click Back to 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 you're trying to send messages through a multi-function printer or line-of-business application, the following article guides you through the process for doing that.
How to Allow a Multi-function Device or Application to Send E-mail through Office 365 Using SMTP

Don't worry if you skip this task. It might take longer for email to start showing up in your new %BRAND_OFFICE_365_SHORT% ... Don't worry if you skip this task. It might take longer for email to start showing up in your new %BRAND_OFFICE_365_SHORT% ... Don't worry. There are more policy settings you can configure later. After we set up this first one, you'll be able to edit ... Don\'t allow devices and apps to delete messages from Outlook. It will move the messages to a special POP folder instead. ... Double-check the email addresses, subject line, and date, and click Back to run the checks again. If that doesn't work, contact ... Download %BRAND_OFFICE_SHORT% files to an on-premises location When launched in download mode, the tool downloads the installation ... Download and run Support and Recovery assistant on the affected computer from https://go.microsoft.com/fwlink/?LinkID=822592 ... Download the %BRAND_AZURE_AD% Module for Windows PowerShell, which includes cmdlets to establish the trust relationship between ... Download the Directory Sync tool (64-bit only) and then configure it to set up synchronization from Active Directory to %BRAND_OFFICE_365%. ...