I am developing a report for our emailing app and I need to identify which client email opened emails sent. I searched and worked with user-agent and I find out if it is Firefox, Chrome or IE, but I can not identify when it is Hotmail, Gmail, Yahoo .... Please, I need your help. Thank you very much in advance.
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If the emails contain images or other elements fetched from your server when opened, do the requests contain useful `referrer` information? I wouldn't think so, but it's worth checking. – David Dec 15 '10 at 17:35
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I dont think so (like you) but I will test. Thanks David. – Pablo Dec 15 '10 at 17:46
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Did you found a reliable solution? – ovonel Oct 23 '12 at 14:19
