B4J Question question on Building a mini "Email based server"

Sub pop_ListCompleted (Success As Boolean, Messages As Map)
    
    Log("list completed")   
    If Success Then
        If Messages.Size > 0 Then
            LogMessage("Found messages: " & Messages.Size)
             For Each id As Int In Messages.Keys
                pop.DownloadMessage(id, deleteMsg) 'if true message will be deleted from the server
                
            Next
            lastMsgId = id
        Else
            Log("No messages.")
        End If
    Else
       LogMessage("Error: " & LastException)
   
    End If   
    pop.Close 'this will close the connection after the messages were downloaded.
 
End Sub