I accidentally deleted an important email, is there a way to retrieve it?

1. Check the Trash/junk folder in your email account, those emails are not deleted but simply moved to the trash folder.
2. Back up your emails regularly, so that if you accidently delete an email, you can restore it from the backup.
3. Contact your email administrator. Your email administrator can help you with understanding the methods and policies that are in place locally for retrieving deleted emails.
4. Utilize third-party recovery tools to scan your email data and find lost emails.