Found this.. hope it helps
Need to reference a message you previously sent? Make sure you're saving sent messages to your Yahoo Mail's Sent folder. Here's how.
Saving sent messages
1.Mouse over the Settings menu icon | select Settings.
2.Click Writing email.
3.Select Save a copy of the message in the Sent folder to enable this option.
- You can deselect it to prevent sent messages from being saved.
4.Click Save.
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