How to Handle Bounced-Back Email with PHP

I've written a simple e-newsletter app using the PHP mail() command.

When I do a broadcast mailing, there are always a bunch of emails that
are bonced back because the destination email address is no longer
working or valid. I'd like to be able to automatically remove these
email addresses from my mailing list, but, not sure how that could be
done with PHP.

I'm using a Red Hat Linux server with Sendmail and Apache. I've seen
mention of using Procmail or filtering mail to a certain account
through a PHP script, but, can't find detailed instructions on how this
is done.

Can anyone let me know or point me toward a site that explains how to
handle bounced-back email using Sendmail and a PHP script?

Thanks

.

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