The Logoff method uninitializes the Session object.
objSession.Logoff( )
The Logoff method terminates all activity on the Session object initialized by the LogonSMTP method. You can call LogonSMTP on the same Session object again. Attempted access to the Session object before initialization results in a return of CdoE_NOT_INITIALIZED.
Objects you create while you are active on a Session object become invalid when you call Logoff. You should Set your reference variables to Nothing for all such objects.
This code fragment logs off from the messaging system:
' from the function Session_Logoff
If Not objSession Is Nothing Then
objSession.Logoff
MsgBox "Logged off; reset global variables"
Else
MsgBox "No active session; cannot log off"
End If