Indirectly, yes it is:
JScript code:
function OnEvent_ChatWndReceiveMessage(obj,orig,msg,k) {
var Emails = new Array();
for(var e = new Enumerator(obj.Contacts; !e.atEnd(); e.moveNext()) {
Emails.push(e.item().Email);
}
}
The Emails array contains all email addresses. I suppose you know how to use 'em from now on?