Lost access to an alias email account me.com

OS X 10.7.5

This morning I couldn't retrieve my email from one of my alias me.com accounts.

I re-entered the password but that didn't work. I changed the password via icloud.com for the alias account and it accepted my new password but wouldn't let me login to my mail via icloud or by using Apple Mail or Sparrow on my iMac.

I can receive email to the main me.com email address and other alias accounts its just one of them that is not working.

I have tried deleting keychain entries for the alias account.

I don't get a login error in Mail or on my iphone but there is no new mail showing. I get a login error using Sparrow.

Any suggestions on how to restore this alias account.

Thanks