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Free Alternatives to paid software

http://www.techtree.com/India/Features/Free_Alternatives_to_Paid_Software/551-111080-899-1.html

How to Set Up Mozilla Thunderbird to Send Mass Emails

Mail Tweak is a Thunderbird extension for Thunderbird ver. 2.0+. It’s a collection of enhancements and workarounds for the email client. The enhancements total around 36 (113KB) and one of them is called Personalize messages.

http://www.makeuseof.com/tag/how-to-send-personalized-mass-emails-in-mozilla-thunderbird/