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I love Sage ACT's eMarketing feature. It is a plugin that allows me to use the Swiftpage email blast and survey service. I can send out mass emails and ensure that none get delivered to people who have opted out of my emails AND (this is the good part) know that they have indeed received, opened, and clicked on links in my emails. The best part is the data gets written back to my ACT database and I now have information that I can search and act upon. In a previous life I used Constant