mail wants to use the "login" keychain

Back up all data.

Launch the Keychain Access application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ If you’re running OS X 10.7 or later, open LaunchPad. Click Utilities, then Keychain Access in the page that opens.

Select the keychain from the list on the left side of the Keychain Access window.

If the lock icon in the top left corner of the window shows that the keychain is locked, click to unlock it. You'll be prompted for the keychain password, which is the same as your login password, unless you've changed it.

Right-click or control-click the entry in the list. From the menu that pops up, select Change Settings for Keychain... In the sheet that opens, uncheck both boxes, if not already unchecked.

From the menu bar, select Keychain Access ▹ Preferences ▹ First Aid. If the box labeled Keep ... keychain unlocked is not checked, check it.

Select Keychain Access ▹ Keychain First Aid from the menu bar and repair the keychain. Quit Keychain Access.

If you're sure there's nothing in it that you need and don't have another copy of, you can delete it.

If you're sure you know all your passwords, you can delete it.

No, This answer is af FAIL.