My Yahoo e-mail account was spoofed.
The email you received was sent by firstname.lastname@example.org (18.104.22.168) which is most likely a bot running on someone's infected computer routing through the Simple Mail Transfer Protocol server smtp.melange.net.
DO NOT OPEN EMAIL.
Delete this and any future emails from this address (I haven't sent out mail in years using this address anyway).
For an example of how to setup a filter to automatically delete, see below:
- In Gmail click the down arrow in the [search box] next to the magnifying glass button
- Type the address in the From text box
- Click Create filter with this search
- Check Delete it check box
- Click Create Filter button