Post Office Protocol Control Events  
 
Event Description
OnCancel This event is generated when a blocking operation is canceled
OnCommand This event is generated when the server processes a command issued by the client
OnConnect This event is generated when a connection is established
OnDisconnect This event is generated when a connection is terminated
OnError This event is generated when a control error occurs
OnProgress This event is generated during data transfer
OnRead This event is generated when data is available to be read
OnTimeout This event is generated when a blocking operation times out