There are two kinds: Free software allows you to send bulk e- mail and track which recipients opened it so you know who’s read your note. Paid services also allow you to track people who unsubscribe and or click through any links inside the e- mail, which is a good way of telling if your e-mail was persuasive in getting recipients to do what you wanted them to do.
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A simple 12-step plan to leap over the wealth gap once and for all.
