MailChimp – Free Online Email Marketing Service
MailChimp is an email marketing service provides an easy approach to send email newsletters to your customers, manage your subscriber lists, and track campaign performance and before sending mail the site is going to take the tools that refines the marketers use (such as segmentation, a/b testing, and ROI tracking) so as to make accessible to each and every individual.
It is easy to integrate internal systems and web applications with our email marketing engine since this platform uses an open API. MailChimp’s add-on gives preview of your campaign in 16 different email clients including Yahoo, Hotmail, AOL and more. This add-on checks your SPAM score and detects for the errors in HTML code.
MailChimp allows you to add your own HTML email design use one of their pre-defined simple templates where you can build and modify your email campaign. With the WYSIWYG you can add images and change color schemes and once when all the modifications are done you can save your template and use it multiple times just by changing the text.
Once if you have registered to MailChimp you are allowed to store up to 500 subscribers, send up to 3,000 emails a month. To make your campaign more personal you can make use of merge tags where you can also change your alias and this service helps you to automatically delete all the bounced emails
Go4 MailChimp


I know MailChimp ever since they launched. Awesome service.