Forum Discussion
.Net mail message, PowerShell and Microsoft Purview Infrmation Protection
I have a PowerShell script that using the .net mail message to send emails. We want to restrict some of those emails to a certain sensitivity (we call it classification) and restrict it to only internal users (which this label does when sending via Outlook).
I have looked at a number of ways to do this but haven't come up with anything that works. Here are the issues:
The smtp server is NOT in Office 365.
The PowerShell window is opened as an admin account so using an Outlook interface might not work.
Currently, I have it set to send remotly (A session is created with the server that is whitelisted and it actually sends the message).
Any information would be of great assistance.
2 Replies
If the SMTP server is not in O365 (but for instance on-premises with Exchange)
What you could do is:
- Add a custom header to your mail message
- Configure the SMTP server to check the custom header and act accordingly on this
For instance add header "X-ClassificationLabel" give it value "InternalOnly" or something. And apply the business logic on the SMTP to for instance prevent forwarding out of the organization.
Is this something you are searching for?
https://learn.microsoft.com/en-us/powershell/module/microsoft.graph.users.actions/send-mgusermail?view=graph-powershell-1.0
Using Send-MgUsermail gives you more options to label emails. Have you checked that already?
