email tracking image duplicate requests

Posted by DEH on Stack Overflow See other posts from Stack Overflow or by DEH
Published on 2010-04-29T09:27:13Z Indexed on 2010/05/01 8:37 UTC
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email

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image

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http

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handler

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tracking

I am embedding tracking images within emails that are being sent from a custom-built opt-in CRM system. The image src is an encoded .gif, such as src="12_34_675.gif". The image is served by an ASP.NET httphandler that decodes the src encoding and serves a transparent image.

Everything works fine, but some email clients request the image multiple times, creating duplicate entries. Some clients make three calls all within one second, and some seem to make tens of calls over a day or so. Mostly email clients make single calls, but these few duplicates are very perplexing. I know I can code around them, but I'd really like to understand what's going on.

I've checked the IIS log files, which show that the duplicate requests are coming from the client machines. I can't think what might be causing these duplicate http requests.

Help!

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