Redirect to O365 login page and back to the Default URL

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SharePoint2013

Am doing my implementation using Provider hosted APP, and O365 account.

There are multiple pages in the App that are designed and coded using Visual Studio.

My Requirement is to send the URL of a Page through Email to multiple users.

I have tried adding the context token string from the current user but when the other user clicks on the URL then the Page opens with the current user context.

can you please provide a solution to this. It has been a long time am struggling with this issue.

My Other Requirement in continuation to the previous is, when the other user clicks the URL or Copy and Paste the URL in the browser then the User should be validated against the O365 login account and then should be redirected to the provided URL.