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PODKIM Signature not validating when sending mail with PHP
 

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  1. PODKIM Signature not validating when sending mail with PHP
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    <p>I was having a problem with gmail/hotmail filtering emails from my server as spam. The Spam Assassin score is quite low so I know that my IP isn't on any blacklists or such which means it is the filtering that gmail/hotmail use stopping the emails from coming through. </p> <p>I did some research and read that using DKIM will possibly resolve the issues I am having. I went ahead and enabled DKIM on my server. Now when I send emails using my email client the tool located here (<a href="http://www.brandonchecketts.com/emailtest.php" rel="nofollow">http://www.brandonchecketts.com/emailtest.php</a>) reports the DKIM signature as valid.</p> <p>The next step was to implement a DKIM signature into my PHP mails. So I went ahead and used this DKIM class located here (<em>http://sourceforge.net/projects/dkim-class-php/</em>) which is a spin-off of PHPMailer.</p> <p>However, when I send emails now, despite containing a DKIM signature I am getting a strange error from the validation tool.</p> <pre><code>result = fail Details: message has been altered </code></pre> <p>You can see the full report here: <a href="http://www.brandonchecketts.com/emailtest.php?email=K86KTXpMbl@www.brandonchecketts.com" rel="nofollow">http://www.brandonchecketts.com/emailtest.php?email=K86KTXpMbl%40www.brandonchecketts.com</a></p> <p>Thanks for any help, I am desperately trying to get this working and have been banging my head against a wall for several hours now.</p>
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    1. COYou appear to be signing the from and subject headers (plus the body). You should check that no mail servers between you and the test program alter those headers or the body contents. The issue could also be that the DKIM signer class is buggy or using the wrong key.
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    2. COHow do I check that no mail servers are altering the body contents? Also the key is definitely correct, just double checked it.
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    3. COExamine the message you sent and the message the test program says it received. Ensure they're identical in the places that are signed.
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