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Yes, and I recommend it. These systems offer both the legally-required opt-in functionality as well as good statistics measurement. There are a dozen good email marketing services and which one makes sense for you depends on how much email you're sending, and how much experience you have with doing HTML, etc. We design dozens of campaigns a year for clients.
I am now an official Vertical Response Partner, which allows me to provide even higher levels of service for my clients.

high-performance email marketing
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