How to connect iCloud Mail to Klearbox

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To connect iCloud Mail to Klearbox, Apple requires an app-specific password. This applies to icloud.com, and also legacy me.com and mac.com iCloud Mail addresses. Sign in at Apple Account, generate an app-specific password named Klearbox, then use it in Klearbox instead of your Apple Account password. iCloud Mail supports IMAP and SMTP, but not POP. If you use an iCloud custom domain, you may still need to authenticate with the Apple/iCloud account identity connected to that mailbox.