have used the product or personally know the creator, you cannot really know for sure if the product does what they say they will. Legally you have protected yourself from the spam police by having an opt in or you only email people who are your customers but to most subscribers, anything not in their niche is spam.
Be consistent — If you are not consistent, and regular in your emails your list will forget about you and then they will delete you upon receipt of the irregular and occasional email. To stay in their mind, be consistent. There are arguments that suggest once a week, some say monthly, regardless of what you decide, be consistent.
Create awesome headlines — Even if your subscriber is expecting to hear from you people subscribe to and get so many emails that yours can be missed. Make sure you create a headline that people want to open, give it some thought.
Personalize — Everyone loves to see their own name, and they love to feel special so personalize your email newsletters so that they see their own name in it. You can even put their name in the subject line which they will like even more. It will make them feel closer and more trusting of you.
Segment — Make sure that you segment your subscribers at the very least into those who have bought and thoughts who have not bought. It is important because you do not want to market the same product to someone who has already purchased it. It is nicer if you can segment further all the way down your product funnel then your marketing can be more specific.
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