Why wont my mac remember my password for yahoo email?

It keeps giving me this pop up...
The Yahoo! IMAP server “imap.mail.yahoo.com” rejected the password for user “[email protected]
Enter your password again or cancel.
I enter my password, click the box for it to remember in in my Keychain and ten minutes later, it pops back up.
My MacBook Pro
Processor  2.4 GHz Intel Core 2 Duo
Memory  4 GB 1067 MHz DDR3
Graphics  NVIDIA GeForce 320M 256 MB
Software  Mac OS X Lion 10.7.5 (11G63)

Why not ask Yahoo tech support? 

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