Ugh that is stupid. Outlook/Exchange already add a bunch of custom headers - you'd think they could use those to opt-in clients that are known to support this f

Ugh that is stupid. Outlook/Exchange already add a bunch of custom headers - you'd think they could use those to opt-in clients that are known to support this feature instead of making the rest of the world opt-out. That approach would provide a better experience for both Outlook users (since they would always know who could actually receive their reactions) and non-Outlook users (who wouldn't have to put up with the annoying reaction spam).