It’s extremely affordable (starting at $15/month), while incredibly powerful and easy to use. I also find that GetResponse have some of the best newsletter template designs around. Aweber is another good call, but I find their user interface a bit outdated and clunky (plus, their pricing starts at $19/month – not a big deal, but considering they’re not quite as good as GetResponse IMO this pushes the needle in favour of GetResponse even more).
You might be doing all the right things to generate leads -- landing pages, gated content, contests, and more. The problem might be that the design or copy itself isn't driving the engagement you need. A/B test (also known as "split test") different aspects of your list-building campaigns with different versions of the same content. This includes the call-to-action text, the color of the gated offer, the time of day you're posting to social media, and even where on your website these signup forms are placed. Sometimes a small change can drive hundreds more conversions.
You might be a little bit worried that popup email sign-ups are going to hurt the user experience of your site. But, many bloggers have found that it isn’t bad at all. For example, Dan Zarella, found bounce rates only increased by a very small amount, while email sign-ups were 1.56% higher – which, in the long term, can be a lot of new subscribers.
There is hardly anyone who doesn’t get excited at the prospect of winning something without making an effort and that too, for free. And if subscribing and giving my email is all it takes, I, for one, am going to participate! Think about it. If a landing page asks you for your email address, why would you give it, unless it was going to give you something in exchange?
If you don’t wish to adopt any of the above-mentioned strategies to build your email list, you can also use blogger outreach programs and software that help promote your company, product or service. They post about you on their site in exchange for product, payment or any service, as a result of which you get mentioned in several places online which is likely to create email traffic for you.
Sponsor a video contest in which customers create a one-minute video about why they like your business, products or services. Ask them to send the videos to you and post them to your Facebook page. Invite visitors to vote on which video should win a cash or merchandise prize. Include an email opt-in on your Facebook page. Be sure to follow Facebook’s rules regarding contests.