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MC289686 – Updated April 21, 2022: Based on learnings from our early rings, Microsoft has made the decision to make additional changes before we proceed with the rollout. Microsoft will communicate via Message center when we are ready to proceed.
Microsoft is making some changes to which forwarded messages are rewritten with Sender Rewriting Scheme (SRS).
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Starting in early November, Microsoft will be further consolidating their rewriting for messages that are automatically forwarded outside of Exchange Online. Not all forwarded messages are rewritten using SRS today. Messages forwarded with SMTP or mailbox forwarding have their P1 Mail From address replaced with the forwarding mailbox address today. This will be changing and SRS rewriting will be used instead.
How this will affect your organization:
Note: This is a behavior change that may result in some disruptions.
What you need to do to prepare:
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Before this change takes effect, customers who route traffic to the internet from their on-premises environment should enable the new parameter SenderRewritingEnabled on their outbound on-premises mail flow connector to avoid any disruptions.
Please click Additional Information to learn more.Additional information
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