@Abhijith ClaySys - The above answer was correct till last week. But last week at Microsoft Build 2021 conference, we announced a new feature so that you can use Microsoft Graph with S/MIME, encryption etc. You may want to get it started from here.
secure (encrypted) mail API
Abhijith ClaySys
1
Reputation point
Is it possible to send secured/encrypted emails programmatically using Microsoft Graph API? (Or any other APIs under the Microsoft product family). If yes, can you please share some documentation links for that?
Microsoft Graph
Microsoft Graph
A Microsoft programmability model that exposes REST APIs and client libraries to access data on Microsoft 365 services.
13,593 questions
Windows API - Win32
Windows API - Win32
A core set of Windows application programming interfaces (APIs) for desktop and server applications. Previously known as Win32 API.
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Deva-MSFT 2,266 Reputation points Microsoft Employee
2021-06-02T12:33:08.103+00:00 -
Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff
2021-05-28T02:26:19.59+00:00 I really appreciate you taking the time to share your thoughts. As of this time, however, the related Q&A indicates sending encrypted email programmatically with Graph API is not supported. And can this reference help you ?