Hello PhilG698,
Good day! Thank you for posting to Microsoft Community.
Based on your post, we have checked from our side and seems after sending email, if you would like to modified that sent email and select “Edit message” option, that changes will only reflect on your side (sender side), it will not update on recipient side because in that Edit message option, outlook have only save option and don’t have send option, as a result, it will not reflect on recipient side.
We do understand your concern, so have also do some more research at our side and seems besides Recall message, at this moment there is no such option or set of conditions that meet your requirements. For the future prospect, we recommend to kindly submit your valuable feedback to our Outlook product development feedback team via Outlook Feedback community site, that site is created to collect users’ feedback for Outlook. At this point, your kind understanding and cooperation will be highly appreciated.
Thank you so much for your precious time. Stay safe and healthy.
Sincerely,
Ankita Vaidya | Microsoft Community Moderator