Gets the UIDVALIDITY of the folder the messages have been uploaded/copied/moved into.
The new UIDVALIDITY value of the target folder after completion of uploading/copying/moving messages into this folder, or -1 if UIDPLUS is not supported by the server.
For more information regarding UIDVALIDITY, see UidValidity topic.
UidPlusResult Class | MailBee.ImapMail Namespace | UidValidity