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Can You Disable Sender Rewriting Scheme (SRS) in Exchange Online?
Question details
The user needs to know if it is possible to globally disable the Sender Rewriting Scheme (SRS) in Exchange Online because it is altering sender addresses during email forwarding.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Forwarding messages from Exchange Online to an on-premises SAP VIM server.
- Observed behavior
- Exchange Online uses SRS for forwarded messages, which changes the original sender address. There is no simple way to disable this globally.
Ensure you have Microsoft 365 Global Administrator or Exchange Administrator privileges before attempting to modify mail flow rules or contact support.
Contact Microsoft Support for Mail-Flow Alternatives
Since there is no supported method to disable SRS globally in Exchange Online, escalating the issue to Microsoft Support is required for a custom architectural workaround.
Microsoft implements SRS to prevent forwarded emails from failing Sender Policy Framework (SPF) checks. Because disabling it entirely could cause legitimate forwarded mail to be marked as spam, Microsoft does not provide a tenant-wide toggle switch.
To resolve issues with on-premises servers like SAP VIM relying on the original sender address, Microsoft engineers must review your specific mail-flow configuration.
Navigate to the Microsoft 365 Admin Center and log in using your Global Administrator credentials.
Click on the 'Support' tab in the left-hand navigation menu and select 'Help & support'.
Open a new Exchange Online support request. Clearly detail your on-premises SAP VIM server forwarding scenario and explain that SRS is altering required sender addresses.
Ask the Microsoft engineering team to review your inbound connector and mail-flow rules to provide an alternative routing method that bypasses SRS.
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Frequently Asked Questions
What is Sender Rewriting Scheme (SRS) in Exchange Online?
SRS is an automated feature in Exchange Online that rewrites the sender's email address when a message is forwarded outside of your organization. It is designed to ensure that forwarded emails pass Sender Policy Framework (SPF) authentication checks at the destination.
Why does SRS interfere with my on-premises SAP VIM server?
When Exchange Online applies SRS during email forwarding, it modifies the original sender address to a rewritten format. If your SAP VIM server or similar on-premises application relies on parsing the exact original sender address for processing, the altered address will cause workflow failures.
Can I disable SRS using PowerShell?
Currently, Microsoft does not provide a straightforward, globally supported PowerShell cmdlet to disable SRS for all forwarding scenarios in an Exchange Online tenant. You must contact Microsoft Support to discuss specific architectural workarounds for your mail flow.
