This is readonly property that holds current user's
state. User's state will change during connection
lifetime, from StateConnecting to
StateSendingMessage, depending on
user's actions. On each change of user's state,
StateChange
will fire so you can inspect this change.
Most of the time value of this property will be
StateLoggedIn. In this state user
will send commands to access mail from mailbox, and it will
accept messages. If you want to extend wodPop3Server
with your commands, you should check that value of State
property is StateLoggedIn (most of
the time).