Welcome to the Microsoft Q&A forum.
Thank you for reaching out to us. I understand that you want to schedule a newsletter in the Outlook Newsletter app so that it can be sent to others at your desired time. Please allow me to provide the following information:
At the moment, the Outlook Newsletter app allows you to compose and send newsletters, but it does not have a built-in feature to schedule sending directly within the Newsletter.
I think your suggestion is excellent, and I believe many other users would also want this feature. In this case, I recommend that you visit the following website: https://feedbackportal.microsoft.com.
Once you access the site, please share your idea about the “schedule newsletter sending in Outlook Newsletter” feature you mentioned. This action will help you connect with others who have the same need. When a post receives high engagement, it helps Microsoft understand customer expectations and potentially provide features that enhance the user experience.
If you have any other questions or concerns, feel free to share them with me. I’ll be happy to assist you.