To backup email addresses from Yahoo Mail, you can use 4n6 Email Backup App. This easy-to-use application enables you to back up your Yahoo Mail emails and subsequently extract email addresses easily. The advanced features of the app allow you to selectively extract email addresses from particular folders, dates, or senders, making it an accurate and effective solution. The pulled email addresses can be exported to CSV or any other file type with ease, which makes it a simple solution for email address extraction.