However, that’s not always the case. Using a double opt-in approach can ensure you have an engaged email list.

To do this, after someone subscribes, send them a follow-up email with a confirmation link ensuring they want to receive emails from you.

For example, HubSpot uses a double opt-in approach to ensure email deliverability rates and engagement is high.

11. You don’t optimize for the mobile experience.

How to Break It: Send test emails and check on your mobile phone.

It’s no secret that most people who read your email will be doing so on their mobile phones.

That’s why it’s important to optimize for the mobile experience.