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i'm working on a project and a task was assigned to me to check if the email was sent , delivered and opened , actually i don't know how to check if it was delivered or not, any suggestions .
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I think it is impossible.
Think it as a real life example.
If you send a letter to someone. You also don't know if he will receives it. Unless he calls you and says "hey, i've your letter"
And also, he has to call you, if he has read the letter which sounds strange, don't you think?
It would be all possible if you've a own message service thing, or application like e.g. facebook. They can store the fact that you've opened the "mail" but than it isn't actually a mail but rather a messege to another user. And doesn't use email adresses nor emails
There is no reliable way to do this. It is not a feature of email.