AcyMailing (
extensions.joomla.org/extensions/content...ing/newsletter/10341
) is the best newsletter extensions for Joomla . Today, I just completed the plugin which integrate Joom Donation with ACY Mailing . The purpose of this plugin is It allows subscribing donors to ACY Mailing newsletter automatically when they donate to your site . Bye this way, you can update with your site by sending newsletter to them .