Posting a word document for a mass email?


My boss had me make a word document and he wants to start sending out mass emails with these periodic newsletters. I tried constant contact but they want me to use their template and my boss specifically wants this word document. What program can I use to submit my contacts and then send out the document that I created? We have about 500 contacts right now but the list continues to grow… also, my boss is pretty penny pinching when it comes to stuff like this so anything cost effective.
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