I am looking for a way where, the users of my website will subscribe to a post, and when my post will be edited or updated they will be emailed by my posts contents,
My post contains, article, Twitter Updates, a Video How will the users get notification when my posts get updated and also when someone comments on posts
Topic subscription email plugin-recommendation updates Wordpress
Category Web
simple you can use any plugin to send update of your site also you can check my site for guide braincuber technologies
Subscribe2 works well for what you need. Just insert the [subscribe2] shortcode wherever you need a signup form.
If you want it to email after edits, try saving it to draft first before publishing. I believe that might be necessary to trigger the email event.
Try this two plugins:
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