kathrynwp on "I want a plugin to integrate the subscription module for my joomla based website"

While Jetpack is not supported on non-WordPress sites, you might want to look out for a more cross-platform solution, such as a blog-to-email feed offered by one of the email marketing services like MailChimp, Aweber, and others.

http://mailchimp.com/features/rss-to-email/
http://www.aweber.com/blog-newsletters.htm