Important notice for Office 365 email customers who have configured connectors

The change will impact you if one of the following scenarios apply to your organization:

  • Your organization needs to send NDR (non-delivery report) messages to a recipient on the Internet and needs to relay them through Office 365.
  • Your organization needs to send messages from your own email server (on-premises environment) from domains that your organization has not entered in Office 365 (see Add Domains in Office 365). For example, your organization Contoso needs to send email as the domain fabrikam.com, which doesn’t belong to your organization.

Important notice for Office 365 email customers who have configured connectors1

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