How to track open status of an E-Mail

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HTML

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<img src="url" style="width:0px;height:0px;">

Call with your script

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<script type="text/javascript" src="url"></script>

Page does not support script?

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<noscript>
	<iframe src="url" height="0" width="0" style="display:none;visibility:hidden"></iframe>
</noscript>

Improve stability : Using combo “script + noscript”