Hello Mou279, I hope you are well. You cannot restore deleted emails. Please take backup to restore your emails for future concern. If you are wondering how to restore email details manually? There is a forum located here,
I have not been able to recreate this in the past, but I am sure if you have a backup of your emails that you should be able to upload the file, as stated in that forum. They say to upload the mail file directly from your backup through FTP, which should restore previous email. You may have to recreate mailboxes if they were removed for whatever reason.