People like more choices, so consider creating subscription levels that let people sign up to receive content that’s relevant to them. For example, if you sell widgets and tax advice, provide three options on your opt-in form that allow users to sign up to receive info about widgets, info about tax advice or both. Further customize by allowing them to designate how frequently they’d like to hear from you — weekly, monthly or only when something really special is going on. People may be more likely to sign up for your email list if they have some control over the content they’ll receive.
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Customer reviews are the "social proof" that encourages people to join in on something. It's one thing for you to tell people to sign up for a campaign, but it's another thing for your happiest customers to say it too. Publish your best reviews from communities like Yelp right to your website. This adds genuine value to your landing pages when people are on the fence about submitting their contact information.
How do you promote an email newsletter