Topic Path: Symbol Reference > Classes > TIdMailBox Class > TIdMailBox Properties > UIDValidity Property
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TIdMailBox.UIDValidity Property

Indicates the mailbox UID value for a messaged added to the mailbox.

property UIDValidity: String;

UIDValidity is a String property that indicates the Unique Identifier Validity value for the currently selected mailbox. UIDValidity is used with UIDNext to determine the permanent Uniqueness identifier for a message in the currently selected mailbox. 

UIDValidity is updatd when the IMAP4 client executes the TIdIMAP4.StatusMailBox method, or when a new mailbox is selected using TIdIMAP4.SelectMailBox.

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