Here is a simple way to solve the issues when the Mac Mail Keychain issues.
- Open a new Finder window.
- Navigate to “~/Library/Keychains” using “Go To Folder…” (Cmd-Shft-G)
- Right-click on “login.keychain” and select “Get Info”
- Find the “Ownership & Permissions” section and verify the following:
- Owner: [You]
- Access: [Read & Write]
- Group: [You]
- Access: [Read only]
- Others: [Read only]