New Post: Message unique identification?

' Initializing the client
Dim client = New ImapClient("imap.gmail.com", True)

' Configuring the client to only download the headers
client.Behavior.MessageFetchMode = MessageFetchMode.Headers

' Setting the headers to be fetched (only Message-Id)
client.Behavior.RequestedHeaders = New String() {MessageHeader.MessageId}

If client.Connect() Then

    If client.Login("name@gmail.com", "password") Then

        ' Requesting messages
        Dim messages = client.Folders.Inbox.Search()

        ' .. Filter the messages by Message.MessageId
        Dim filteredMessages = messages.Where(Function(msg As Message)
                                                  Return msg.MessageId = "Sample-Message-Id"
                                              End Function)

        ' After you filtered the messages, reset the requested headers by
        client.Behavior.RequestedHeaders = Nothing

        ' Or client.Behavior.RequestedHeaders = MessageHeaderSets.Minimal;

        For Each message As Message In filteredMessages

            ' Download the messages with another fetch mode. 
            ' The second parameter indicates that the headers should be requested one more time
            message.Download(MessageFetchMode.Basic, True)

        Next

    End If

End If