Hey abridge683,
I found this, which might apply to your situation:
Use of Secure Tokens for Authentication
When you access iCloud services using Apple’s built-in apps (for example, Mail, Contacts, and Calendar apps on iOS or OS X), authentication is handled using a secure token. Using secure tokens eliminates the need to store your iCloud password on devices and computers. Even if you choose to use a third-party application to access your iCloud data, your username and password are sent over an encrypted SSL connection.
via: iCloud: iCloud security and privacy overview
http://support.apple.com/kb/HT4865
I would try the following, see if that helps:
- Choose Preferences from the Mail menu.
- Click Accounts in the Preferences window.
- Select your iCloud account from the list of accounts.
- Click the Advanced tab and verify these settings:
Authentication: "Apple Token"
via: iCloud: Troubleshooting iCloud Mail
http://support.apple.com/kb/TS4002
Best,
Delgadoh