Hi,
I think there might be a rule trashing all the emails. Selbol has provided instructions for that. I leave more steps below, also please check out the link for more options.
Via https://yourwindowsguide.com/2026/02/outlook-hacked-draft-email.html#gsc.tab=0
#1:
It’s possible the Outlook hacker created rules in the Microsoft To-Do app, which could be causing the Email to appear. Once you flush out Microsoft To-Do, the Outlook hacked draft Email issue can go away. Go to the Software using this link and clean everything:
Web Browsers
Microsoft To-Do login
This should resolve the issue, most probably.
#2:
Some users have reported that deleting unrecognized contacts from Outlook here would also help them regain access to their accounts. The list might be pretty big if you have large contacts.
#3:
Please login to Teams > Settings > Accounts and orgs and try to leave organizations if any.
A Windows MVP writes content on the above website, so it is safe. However, do watch out for the ads. It should translate into your Browser language automatically.