Ab dem 01. Februar 2017 wird Microsoft:
Starting on February 1, 2017, by default, Microsoft Office 365 will no longer support relaying email messages in the following scenarios:
- Your organization has to send non-delivery reports (NDRs) from the on-premises environment to a recipient on the Internet, and it has to relay the messages through Office 365. For example, somebody sends an email message to john@contoso.com, a user who used to exist in your organization’s on-premises environment. This causes an NDR to be sent to the original sender.
- Your organization has to send messages from the email server in your on-premises environment from domains that your organization hasn’t added to Office 365. For example, your organization (Contoso.com) sends email as the fabrikam.com domain, which doesn’t belong to your organization.
- A forwarding rule is configured on your on-premises server and messages are relayed through Office 365.For example, Contoso.com is your organization’s domain. A user on your organization’s on-premises server, kate@contoso.com, enables forwarding for all her messages to kate@tailspintoys.com. When john@fabrikam.com sends a message to kate@contoso.com, the message is automatically forwarded to kate@tailspintoys.com.From the point of view of Office 365, the message is sent fromjohn@fabrikam.comtokate@tailspintoys.com. Because Kate’s mail is forwarded, neither the sender domain nor the recipient domain belongs to your organization.
Additionally, your message transfer agent (MTA) will receive a rejection with the following message:
451 4.4.4 Relay Access Denied, unrecognized sender domain. ATTR36
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