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in (Web and Desktop), I need to observe sending email but it seems to be the API available from office.js does not seem to have any event or method for this functionality.
In fact, my requirement is to inject tracking pixels when a user clicks on Send button thereby collecting the outgoing email's conversation id.
Any suggestion?
It is available now. On send feature for Outlook add-ins was implemented with lots of limitation, but at least it's there. Outlook add-in on send code sample is available as well.
Slava is correct. This is a common request and the team is considering solutions for this scenario.