Unique ID Listing

<messaging> (UIDL) A system used by POP3 electronic mail servers to uniquely identify a mail message.

Normally, a message is identified by its position in the list of messages but this will change when an earlier message is deleted.

The UIDL is a fixed string of characters which is unique to the message.

The UIDL of a message never changes and will never be reused, even when the message has been deleted from the user's mailbox.

RFC 1725 (http://ds0.internic.net/rfc/rfc1725.txt).

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