Question about email Pinging using VBA

That's not possible. You can ping domain.com to tell whether it exists, but you can't tell whether an email address actually exists without sending an email, and not even then necessarily.

Not sure, but got below link which check availability of users active/Offline through communicator...

http://officetricks.com/find-availab...cel-vba-macro/

Or a Function which will tell Email ID is valid or not

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Or can check below Link

http://www.excelforum.com/excel-prog...esses-vba.html