If you use an Exchange e-mail account, you can recover deleted e-mails within 14 days after you permanently deleted them.
In the Exchange e-mail system, you delete e-mails in most e-mail programs (like Outlook, for example) in 2 steps:
Please proceed as follows to recover a permanently deleted e-mail within 14 days after it has been deleted:
3. Another window will open (if this does not happen automatically, you need to enable pop-ups for https://exchange.uni-mannheim.de in your web browser) and will show all e-mails you deleted within the last 14 days.