If you aren’t concerned about cyber security threats, you should be. Cyber crime is expected to cost companies over $6 trillion by 2021, and smaller companies are just as vulnerable as big global enterprises—sometimes more so. Insurance companies are especially vulnerable, because they work with large volumes of sensitive client information. This means you have to be especially committed to protecting your customers’ data.

Cyber threats are new and constantly changing. Here are a few things you can do today to make your business and client information more secure.

Marketing professionals will tell you: the money is in the list. A strong list of email addresses from people who both have the money to buy from you and have an interest in what you sell is worth its weight in gold. But how do you build that list?

Buying lists can be hit or miss—and it’s usually a miss. It’s always most effective to build the list yourself. But that takes some strategy.

Here are some ideas for getting people to opt into your email marketing.