Proactive messaging from external trigger (Postman) using Python + M365 Agents Toolkit

[kameshm05]

I have built a Teams bot using the Microsoft 365 Agents Toolkit for Python (microsoft-teams-ai) and the bot works correctly for normal conversations.
Now I need to send a proactive message to a Teams user when an external trigger happens (example: Postman request, webhook, or Power Automate call).

My question:
Is it possible to send a proactive message using Python and the M365 Agents Toolkit, triggered externally?
If yes:
What is the correct approach for proactive messaging using the microsoft-teams-ai SDK only?

1. Do I need BotBuilder or should this work without BotBuilder?
2. Is there another recommended approach (Graph Notifications, something else)?
3. Is there an official sample using the Python M365 Agents Toolkit?

I’m specifically asking about proactive messages initiated outside the Teams conversation, coming from Postman/Power Automate, and delivered to the user in Teams.

Thanks!