Disconnected event is fired when wodPop3 disconnects
from the server, either by using Disconnect method,
or because server closed the connection. If error occurred,
ErrorCode and ErrorText arguments will provide information
about the error.
Disconnected event can be fired also as a result of
calling Connect method - if
disconnection occurred because server was unavailable, bad
login/password was supplied etc.
At this point wodPop3.Messages collection
is not destroyed - you still have access to all downloaded
messages from the previous session. They will be destroyed
on next call to Connect method.