Option Explicit

Private WithEvents MSN As MessengerAPI.Messenger

Private Sub Command1_Click()
Dim ContactName As String
Dim Contacto As IMessengerContact

ContactName = "spleak@hotmail.com"

For Each Contacto In MSN.MyContacts
    If Contacto.SigninName = ContactName Then
        Contacto.Blocked = True
    End If
Next
End Sub

Private Sub Form_Load()
Set MSN = New Messenger
End Sub