You could save the data of all the mail the programme has ever sent stored.
Make it acessible to another programme that monitors the incoming mailbox of your original programme's sender.
That one learns about failure receipts and takes the action you feel necessary.

Cheers, Sören

In reply to Re: Net::SMTP success / failure response by Happy-the-monk
in thread Net::SMTP success / failure response by Anonymous Monk

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