The introduction of email authentication mechanisms like SPF, DKIM, and DMARC have improved email security and spoofing prevention. However, some scenarios have been disrupted by these authentication...
Updated Jul 01, 2019
Version 2.0
Blog Post
There is nothing you can configure.
https://docs.microsoft.com/en-us/office365/troubleshoot/antispam/sender-rewriting-scheme
Upcoming changes:
- Starting in July 2021, we'll start to roll out a new relay IP pool, which may affect current SRS rewriting behaviour. Messages that qualify for this relay pool won't be rewritten by SRS, and be sent out of IPs that won't be part of the Microsoft 365 SPF record instead. The main change is for messages that fail SPF checks when they are sent to Office 365. SRS will no longer fix these failures. For more information, check the post about the relay pool change in Message Center or see Outbound delivery pools.
- Starting in October 2021, we'll start to use SRS to rewrite all messages forwarded by using SMTP or mailbox forwarding. This will consolidate the behaviour to use SRS for all forwarding in the service. Due to changes in behavior, disruptions may occur. For example, messages sent to on-premises will no longer be rewritten.
Regards
Andres