Are there any way to know whether user open mail ?

Posted by haim evgi on Stack Overflow See other posts from Stack Overflow or by haim evgi
Published on 2009-06-04T05:43:03Z Indexed on 2010/05/16 15:10 UTC
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we build newsletter module, and send email to members. The environment is LAMP. Are there any way to know whether member open the mail ? i hear about put image if 'php' source , what is the best way?

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