3.2.5.2 Receiving an IMAP4 Delegate Access Extension Message

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Servers SHOULD<2> support the IMAP4 delegate access extension. When the server receives the IMAP4_DELEGATE_LOGIN_Command message, it SHOULD take the following actions:

  1. Authenticate the delegate using the delegate's alias or UPN and password.

  2. Verify that the delegate has access to the delegator's mailbox.

If the authentication succeeds and the delegate has access to the delegator's mailbox, the server returns an OK response, as specified in [RFC3501] section 6.2.3. If the authentication does not succeed or the delegate does not have access to the delegator's mailbox, the server returns a NO response.