I am trying to build an app in Python which uses MS Graph to send emails from a shared mailbox, I've been focusing on the msgraph-sdk module. I need this app to run as a daemon process (no human interaction required), so figured the suitable auth-flow here is ClientSecretCredential - application rather than delegation. The GraphServiceClient object in msgraph-sdk gives 2 avenues to work with self.me and self.users. My understanding is I need self.users for this specific case. I do not understand the required permissions that need to be set up for an application level credential to send mail from a shared inbox. I have followed the tutorial @ https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=python using credential flow example from https://github.com/microsoftgraph/msgraph-sdk-python/blob/main/docs/applications_samples.md And get: Error: ErrorAccessDenied Access is denied. Check credentials and try again. There is a part of the tutorial above to get a token, which works as expected - but I think msgraph-sdk will handle that under the hood? Is this even possible with App-Only Creds, and sending from a Shared Mailbox? Any help appreciated, thanks! Continue reading...
