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Ramu Denduluri's avatar
Ramu Denduluri
Copper Contributor
Oct 24, 2018

Rejecting message based on email header ( in Office365 )

I have a very simple 'mail flow' rule which states that exchange should reject a message when it sees an email that has a header set to a specific value. The rule is in active/enforced mode but I can...
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Ramu Denduluri's avatar
Ramu Denduluri
Copper Contributor
Oct 27, 2018

Hi Rishank,

 

I have already reached out to support. They said they will look into the issue.

 

Any idea if it would work for headers such as Message-Id or Content-Type . These are typical headers that every message includes. I have verified it work for From and To headers, but there are specific rules for such fields (from/to/cc/bcc/subject). You can guess that Exchange treat these as fields, not headers. Then why provide rules which talk about mail headers, just wondering.

 

Thanks for your help. 

Rishank Ganguly's avatar
Rishank Ganguly
Brass Contributor
Oct 28, 2018

Hi Ramu, 

You are right, Exchange treats all these as typical headers, and they accept values from any email systems. So these can be treated as Fields. Now, there are some X-MS headers which accepts certain values. Check this article if it helps:

https://docs.microsoft.com/en-us/exchange/client-developer/exchange-web-services/how-to-provision-x-headers-by-using-ews-in-exchange