CDO check if email was received/valid

[Gentopa]

I want to add users with bad/invalid emails to a table in my database. (why: professors add students that may have written their emails down wrong, and we want to contact the professors with a report asking them to verify)Is there something like a delivery receipt to see which were actually received: http://classicasp.aspfaq.com/email/can-i-get-cdo-messages-to-return-a-read-receipt.htmland then add emails to my table if the response from mail server is anything other than received.I would like to receive this information right when the script is run, but if this is not possible - can you think of a way to do this scripting-wise? I could run it once a week. It seems like VRFY is disabled on a lot of mail servers so I was unsure whether this was a valid option: http://onlamp.com/pub/a/onlamp/excerpt/sendmailckbk_chap01/index1.html?page=2My code sends emails out fine; I just need to add this functionality.