Outlook email reactions

Dear @Andrew Wren ,

Good day! Welcome to Microsoft Q&A forum!

Regarding this matter, at the moment, Outlook reactions are limited to the emoji set provided by Microsoft, and there isn't a built-in option to add custom reactions.

If you'd like this feature to be considered for future development, I would encourage you to submit feedback directly to the Outlook product team by going to Help > Feedback within Outlook and selecting Suggest a feature. This is the best channel for product suggestions, as feedback submitted there is reviewed by the Microsoft engineering team when evaluating future enhancements.

You could also submit your feedback to the Feedback portal and send the link to it here so other users with the same query could add their votes to your feedback.

Please note that this is a community forum where users help one another. I am not involved in product design decisions and do not have direct access to the development roadmap. However, I want to assure you that your feedback has been acknowledged and is valued._

Thank you for your kindness and understanding!