Error 12221 on Mac when accessing webmail
macosError 12221
Symptoms
Mac webmail throws 12221.
Likely cause
Cached keychain credentials for mail.mil are stale.
Fix
1. Open Keychain Access > login > All Items.
2. Search for 'mail.mil' and delete every entry that appears.
3. Restart Safari and retry.
Sourced from militarycac.com. Rewritten for clarity.
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