I have a laptop and have access to email from the xfinity web site on an app. There is no trash symbol or any way to retrieve old messages. Thank you for any help you can give.
If you are using only the webmail interface with your browser, when you are on the Inbox page right-click on the Trash folder. You will see a small menu and one of the options is to "Recover Deleted Items".
For information on the "Recover Deleted Items" feature, see here---------