Insert Custom Message Header value in an email

Question

Hello,&nbsp;Environment: Exchange OnlineIs it possible to Insert Custom value in the Message Header of an email?&nbsp;Regards,&nbsp;Dematri

vasilmichev · Answer

Yes, via Transport rules: https://docs.microsoft.com/en-us/exchange/security-and-compliance/mail-flow-rules/mail-flow-rule-actions

admin o365 · Answer

Thanks Vasil....&nbsp;Sorry I should have added earlier -&nbsp;&nbsp;Is it possible to add the sender address to an existing message header value (type: X-Protective)Here, sender address will change based on the sender id.&nbsp;Any suggestion will be of great help.

vasilmichev · Answer

In general yes, but depends on the header. Some headers will be stripped/overwritten by the server, you cannot for example "forge" and antispam header, etc.

admin o365 · Answer

Any article that you shared that provides the approach of how to get it tested?

vasilmichev · Answer

there are some examples in the article above.

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Insert Custom Message Header value in an email

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