CDO Message and Undeliverables

[Jster]

I have the following code that sends an email. Is there a way i can track which ones were undeliverable and how?

Set objSendMail = Server.CreateObject("CDO.Message")
objSendMail.HTMLBody = htmlStr1
objSendMail.TextBody = txtStr1
objSendMail.From = frmStr
objSendMail.To = toStr
objSendMail.Subject = subjStr
objSendMail.Send


Thanks,
Josh