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Do a google for "gammadyne email deliverability" and click on the first result. This is a good article that will help you out, even if you don't use gammadyne mailer.

I've used both Gammadyne Mailer and Sendblaster and prefer GM. It has a lot more features, and can read email addresses directly from your CSV file. Either way, like dbk03 was saying, you will have to relay through an SMTP server.