Help: How to recover mail messages in Apple Mail via Time Machine?

I've been using Apple Mail for long time, and have a 2TB Time Capsule drive.

2 days ago Mail would not download from my Yahoo account.
I could see the mail in the web portal, and then went to download the mail. I'd get a brief "downloading 9 of 9 messages", but nothing would download.
I re-started the computer, etc.

So, I opened up the prefs box, and deleted the yahoo account and re-established it, thinking that would re-connect the dots...


But, ALL my email NOT on the server and NOT put into folders is AWOL, gone.
600 emails......

I tried Time Machine but how the heck do you recover email messages inside Apple Mail?
Selecting recover the App iteslf does not work.

thx for all the help

I finally recovered by manually restore the library/preferences/com.apple.mail.plist from last TM backup, then open Apple Mail again, and I was able to then go into TM and restore all the old emails.

here is method
http://discussions.info.apple.com/message.jspa?messageID=11454404