Method POP3Client():undeleteMessage() Foundation
Unmark all messages which are marked as deleted.
:undeleteMessage() --> lSuccess
The method returns .T. (true) if the messages could be unmarked, otherwise .F. (false) is returned.
This method is an undo for all calls to :deleteMessage( <nMsgIndex> )(while this method name suggests a single undelete, all messages marked for deletion are unmarked). The POP3 server does not actually delete the messages until the connection is dropped, so any deletes can be unmarked during the connection time.
Note: This method invalidates all results which are obtained by preceding calls to :getMessageIdentifier(), :getMessageSize(), :getTotalMessageSize() or :getNumberOfNewMessages().
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