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load image from server when user opens an email

 
Ranch Hand
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I wanted to load image from server when user opens an email. This is because I want to track users who reads an email.
Now, my query here is how to load image from server and and send some parameters.
 
Marshal
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You just send HTML as the e-mail body and include an ordinary tag which loads the image. The URL can of course include parameters.

Probably you'll want to have a servlet return the image, so it can take the parameters and store them in your user-tracking database.

Hopefully that covers the question, but don't hesitate to ask more if it doesn't.

(By the way when I told my wife that companies track people's e-mail that way she was repulsed and described it as "creepy".)
 
Saloon Keeper
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Most email clients won't load the images by default, though, and the user may not force it to. (I know I never do.) So there's no guarantee that the servlet will be triggered.
 
Rancher
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@Paul You need to explain the real world to your wife.  There are too many bad guys putting things  on the web where a wrong click can load malware.
 
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