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copied!<p>The code works in the following way:</p> <pre><code><style> /* Print stylesheet */ @media print{ #_t { background-image: url('https://a6.emltrk.com/XX0000XX?p'); } } /* Forward stylesheet */ div.OutlookMessageHeader, table.moz-email-headers-table, blockquote #_t { background-image:url('https://a6.emltrk.com/XX0000XX?f') } </style>  <div id="_t"></div>  <img src="https://a6.emltrk.com/XX0000XX" style="display:none" width="1" height="1" border="0" /> </code></pre> <p>There is an image that gets loaded when the email is viewed. This counts the "opens" statistic.</p> <p>There is also an extra div (with the id _t) which is referenced from a stylesheet. The <code>@media print</code> section applies a background image when the email is being printed. The url of the image has the additional <code>p</code> attribute, which probably tells Litmus that the email is being printed.</p> <p>The forward statistic is calculated in a similar manner: a background image is loaded when certain elements are present. Outlook matches the <code>div.OutlookMessageHeader</code>, something else (looks like Thunderbird perhaps, given the <code>moz</code>) matches <code>table.moz-email-headers-table</code>, and everything else matches <code>blockquote #_t</code> (using the additional DIV again). These elements are created by the email client when the forwarded email is being composed. The image is this time loaded with the <code>f</code> flag, which tells Litmus to calculate the forward statistic.</p> <p>These statistics must be taken with a grain of salt, however: most email clients will block images of any kind until the user decides to show them. Most webmail clients will completely strip out any stylesheets, which makes the print and forward statistics irrelevant for clients like Gmail, Hotmail, and Yahoo! Mail.</p> <p>I hope this makes sense! I haven't quite figured out the glanced/deleted statistic yet. When I do, I'll be sure to let you know.</p>

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