To give the same email address to two users, edit their accounts and set the email address. Your answer is pretty much in the question
On the user-management question, could you please re-read the answers you got the last four times you've asked this? The answers are there.
(Sorry if that appears rude. I don't intend it to be rude. Grumpy, I will admit to. It is annoying when you've already asked, had the answers, and you go and ask again showing that you are ignoring people who have tried to help you with it in the past)
that doesn't resolve my problem.
I think you doesn't understnd my question.
Let us consider one example:
I have an user sharpDev in jira having ID firstname.lastname@example.org
now thier are two employees whom I want to assing this emailid so that what ever the respective updates are in the related project they can get them automatically.
So give them the same email address. This is not a problem.
However, it actually sounds like you want two people to share an email inbox (which is not quite what you've said in either your question or comment). This is nothing to do with Jira, you need to do it on the email server and arrange something with the human process. Jira sends mail to a mail address, that's it. Sharing an email box can be a bit of a pain though, and it makes a real mess if you share accounts in Jira, so I'd recommend thinking this through more carefully.
If you want two separate users to get notifications of updates, then think about how to include them on the issue. The most obvious way is to have them "watch" the issues they need to be notified about. Whatever you're trying to do though, look in the "notification scheme" to assess what Jira will send and to whom. See https://confluence.atlassian.com/display/JIRA/Creating+a+Notification+Scheme
as @Nic said you need to edit user profiles!!
check this doc to edit user details in jira 4.3
"User Management button is not available" in jira 4.3 this button not availble in jira 4.x it got changed in latest jira versions
There is no "under". As has been explained to you in other answers, a user has an email address. There is no "add a user under", a user is a single entity with a single email address.
If you want to have multiple people get emails when email is sent to a single address, then you need to do it as a mailing list or group. Which is done, as I said before, on your email server, not in Jira.
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