Hi Matt63PA,
Welcome joining the community.
According to my research, you can follow below steps to create an email address excel list from your sent emails folder:
1: Launch Microsoft Outlook desktop app. Click on File > Open & Export.
2: Select Import/Export option.
3: Select Export to a file option > Next.
4: Select Comma Separated Values >Next
5: select Sent Items folder> Next.
6: select the file saving location using the Browse button; click Next.
7: Checkmark Export “sent items” from folder and click Finish.
8: Open the CVS file, you can find the recipient’s email addresses in “To: Name” area.
Hope above information helps.
Regards,
Grace