What e-mail program do you use? It seems to me that it would be much more reliable to have every email you send registered in a database (i.e. whoever you're emailing to), and if you get a bounce from that domain within 24-48 hours you let it through, otherwise you drop the email from your bounced list.

There are, unfortunately, more then just MAILER-DAEMON@* daemons out there. Has that proved a problem for you?

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In reply to Re: Detecting bounced mails by Vautrin
in thread Detecting bounced mails by Corion

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