TIdSMTPFailedRecipient and OnFailedRecipient with Indy 9

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Subject: TIdSMTPFailedRecipient and OnFailedRecipient with Indy 9
Posted by:  Louis Valmeras (valmlou…@hotmail.com)
Date: Mon, 25 Oct 2010

I am using Indy 9 TIdSMTP to send emails. I would like to check emails which are not received because for exemple invalid email address.
I cannot find the event TIdSMTPFailedRecipient and the property OnFailedRecipient. It seems that they exist only with Indy 10.
How can I implement them with Indy 9 or simply how to check if emails are received?

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