I makeing a sort of tool for Msn Messenger to block specefied Email-adresses in a list box.

Somebody know how to make this?

Something that looks lik this (i tell you this is wrong)
If pSourceUser.EmailAddress = List1.ListCount Then
pSourceUser.SendText bstrMsgHeader, "You been blocked", MMSGTYPE_ALL_RESULTS
End If
Thanks (sorry for my bad English)