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2.2.2 POP3 Delegate Access

The POP3 Delegate Access extension extends the USER command, as specified in [RFC1939] section 7. The POP3 Delegate Access extension provides part of the logon mechanism for delegates to access a delegator's mailbox. There are four formats for using delegate access with POP3. In every case, the part after the last "/" of the user string is the mailbox identity in either alias or user principal name (UPN) format. The four formats are as follows:

  • "USER" SP domain/delegateuseralias/principalalias

  • "USER" SP domain/delegateuseralias/principalupn

  • "USER" SP delegateuserupn/principalalias

  • "USER" SP delegateuserupn/principalupn

The domain part of the USER string represents the delegate's domain.

The "delegateuserupn" part of the USER string represents the UPN of the delegate, which is composed of the user's identifier and domain, as specified in [RFC822] section 6.1.

The "delegateuseralias" part of the USER string represents the e-mail alias of the delegate.

The "principaluserupn" part of the USER string represents the UPN of the delegator, which is composed of the delegator's identifier and domain, as specified in [RFC822] section 6.1.

The "principaluseralias" part of the USER string represents the e-mail alias of the delegator.

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