To view the full headers of an e-mail in the classic Yahoo Mail:

If you see help reading the full e-mail headers please see our guide on How to read full e-mail headers.
If you have any questions about Yahoo Mail please post them in our E-Mail Service Provider Support Forums.
- Open the e-mail
- Select Show Full Headers near the lower right of the e-mail message

If you see help reading the full e-mail headers please see our guide on How to read full e-mail headers.
If you have any questions about Yahoo Mail please post them in our E-Mail Service Provider Support Forums.