It is built-in, it is somewhat limited but if you go into Outlook Web, have a look at filters. Doubtless would need some clever lateral thinking to get something out of it - but you never know, you might think of something. Depending on your Office 365 licensing, you might also have access to Power Apps or Flow and that is reasonably powerful and you might be able to create a flow that would post to a Node-RED http-in node, using it as a "webhook".
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