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I am sending Email alerts through Trigger now how to check whether the user read the message or not?

This cannot be done using apex alone; because the return reponce does not contains that type of information. The only information you can receive back is wether or not the message made it to it's destination, not if it was read or not.
Ravi NarayananRavi Narayanan
i dont think it is possible
Hi Ravi Narayanan,
This types of Questionsasking in interview....
Shri RajShri Raj
It's a related list you can put on the contact or lead object.  It's called "HTML Email Status"

Here is the linke and description