Using New Outlook on Windows for professional communication and productivity
Dear Beckons Oslo,
Unfortunately, there is currently no built-in Outlook feature that can automatically insert the actual send date and time into the email body or signature when a message is sent. Outlook signatures are typically added when you compose the message, not when the message is ultimately delivered.
I agree that this would be a valuable feature, especially for users who frequently use Schedule Send. Therefore, I recommend submitting feedback to the Microsoft Product Team. Customer feedback is reviewed by the Outlook product team and helps influence future feature enhancements. You can submit feedback directly from Outlook by going to: Help > Feedback.
To ensure your feedback reaches the right teams, you can also submit your feedback directly to Microsoft Ideas · Community, where Microsoft's product development team can know your requirements and ideas for product improvements.
If you have any questions or if I have misunderstood anything, please feel free to reach out.