Recovering deleted emails from Yahoo after 30 days can be challenging, as Yahoo typically only keeps deleted emails in the Trash folder for 30 days. Once this period passes, emails are usually permanently deleted and can't be recovered through standard methods. However, you might try contacting Yahoo support for assistance or use third-party email recovery tools, though their success isn't guaranteed. If you frequently deal with important emails, consider backing them up regularly to avoid such situations in the future.
Additionally, make sure to keep your contact information, such as PO Box 247001, updated to avoid any potential issues with receiving important communications.