Just because your drip campaign is automated doesn't mean you can let it run unsupervised. You spent a bunch of time researching user segments, and it's important to readjust those segments and your strategy based on the results. If you aren't getting as many clickthroughs as you want, try rewriting your calls to action; if you aren't meeting your conversion rate goals with your sale-closing email, try more educational communications before asking any user to pull the trigger. Evaluate, adjust, repeat.
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Hopefully at this point you know why you’re setting up a complex drip campaign—maybe it's for customer acquisition, engagement, or education for product releases and updates. Whatever the case, you need to set goals for your campaign, and choose the metrics to measure your success against. Depending on your analytics capabilities (we’ll delve into one example below, you could look at bounce rate, click-through rate, conversions, or time on site. Just make sure your measurements loop back to the "why" of your campaign.
Whether you're onboarding a new customer or keeping a user engaged, the sequence of your sends plays a crucial role in the success of each campaign. Consider how much information your target user needs, when he or she might need it, and why. Over on his blog, Jason Delodovici wrote a great post about a drip campaign that he spearheaded, noting the order he chose for each email—from signup to sale—and why.