If you are an Keap / Infusionsoft user then you no doubt are aware of single and double opting in your email subscribers.
Single opt-in. The advantage is that it is easier for people to sign-up and it gives you the biggest list (which makes for a happy marketer). But the downside is that you are more likely to get spam complaints, which does not make Keap / Infusionsoft happy.
Double Opt-in....
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