Few days ago, I went to open Mail and was greeted with several notifications (for each accounts). Of course, I was surprised...went to Keychain and all email accounts disappeared and I have several (a lot) iMessage encryption key - public key as well as iMessage signing key - public key...with El Capitan, Apple removed Keychain's first aid. How could this happen? Would Keychain rebuild itself if I delete all content from ~Library/Keychains? I never liked Keychain.