You need to send emails on behalf of domains that do not belong to your organization.Your organization needs to send NDR (Non-Delivery Report) or bounce messages to a recipient on the Internet and needs to relay them through Office 365.″ Additionally, if your organization needs the following scenarios to continue to work (and most hybrid organizations do), you need to ensure that you follow step 3b. Such emails will get rejected with the following error message: “ 550 5.7.64 Relay Access Denied ATTR36. 1, 2017), Office 365 will no longer support relaying emails if a hybrid customer has not configured either step 3a or 3b (see detail above). This protects your organization, your domain, and your IP reputation.īeginning J(changed from Feb. Therefore, it is important that organizations with hybrid deployments ensure that they fulfill either step 3a or 3b. If neither step 3a nor 3b is true, Office 365 will NOT be able to know deterministically whether the email sent from your on-premises environment belongs to your organization. For more information, see Add Domains in Office 365.ī) Your on-premises email server is configured to use a certificate to send email to Office 365, and the CN (Common-Name) or SAN (Subject Alternate Name) in the certificate contains a domain name you have registered with Office 365 and you have created a certificate based connector in Office 365 with that domain. you have registered your domain with Office 365). Configure your on-premises servers to relay via Office 365.Ī) The sender domain belongs to your organization (i.e.Create one or more connectors in Office 365 to authenticate emails coming from your on-premises mail servers, using either the sending IP address or a certificate.emails from your on-premises environment (mailboxes, applications, scanners, fax machines, etc.) that are sent to Internet recipients will be routed to Office 365 first, then sent out.įigure: Email relayed from your on-premises email servers to the Internet via Office 365įor this relay to work, your organization needs to follow these steps:
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If your organization has a hybrid deployment (on-premises plus Office 365), you often need to relay emails to the Internet via Office 365-i.e. To make sure that your mail flow isn’t interrupted, we strongly recommend that you read this post and take any necessary action before the deadline (July 5th, 2017). If you are an Exchange Online or Exchange Online Protection (EOP) customer and you have configured connectors, this post contains important information that might impact your organization.
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