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<h3>Credits
</h3>
<p>
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
If you found this idea, project or code useful, please make a donation so that we
can have more time for development. All donations are greatly appreciated.
<br>
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="eharris@puremagic.com">
<input type="hidden" name="item_name" value="Greylisting">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="tax" value="0">
<input type="image" src="https://www.paypal.com/images/x-click-but21.gif" border="0" name="submit" alt="Donate!">
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If you wish to contribute via a method other than Paypal, please contact me directly
at
<a href="mailto:eharris@puremagic.com">eharris@puremagic.com
</a>.
</p>
<p>
Thanks to the following people for providing valuable feedback and
trying to shoot my theories full of holes:
<ul>
<li>Brad Roberts
<li>Brian Michalk
<li>Corey Huinker
<li>Bob Apthorpe
</ul>
</p>
<p>
Thanks to
<a href="http://www.lightsphere.com/">Jacqueline Hamilton
</a>, who
helped improve the look of these pages.
She has also written a great book on web programming with perl that is available
<a href="http://www.cgi101.com/">here
</a>.
</p>
<p>
Thanks to
<a href="http://www.paulgraham.com/">Paul Graham
</a>, whose paper
<a href="http://www.paulgraham.com/spam.html"><i>A Plan For Spam
</i></a>
caused a revolution in the spam fighting world, and was also a bit of inspiration
that helped to get me thinking about other ways to solve the problem.
</p>
<p>
Thanks to Charles Ying for developing Sendmail::Milter which made this project
a lot easier to prototype and test, as well as a whole slew of other developers
for producing Sendmail, Mysql, Perl, Amavis, and Spamassassin.
</p>
<p>
Thanks to all the administrators and people who create and maintain
various blacklists and other anti-spam software and databases that have
helped in keeping spam from making email useless.
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