MailerLite plugin 
MailerLite plugin is used by 0.00% of sites
Official Website
https://ru.wordpress.org/plugins/official-mailerlite-sign-up-forms/Category
WordPress pluginsThe official MailerLite signup forms plugin makes it easy to grow your newsletter subscriber list from your WordPress blog or website. The plugin automatically integrates your WordPress form with your MailerLite email marketing account.