We would also like this, both for incoming and composed messages. We would like changes to the subject line and the body message to trigger an event so that our Add-in can respond to those changes.
To provide some context, our add-in helps users to file messages into document management systems, SharePoint ,etc. We anticipate where the message should be filed based on its: content, subject line, recipients and sender. So changes to the subject line or the body of the message should impact our suggestions on where to file it.
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