Subscription plugin which supports MailChimp, Aweber and Feedburner.
https://wordpress.org/plugins/wp-subscribe/
Widgets · WordPress Plugins
Get access to data on 6,219 websites that are WP Subscribe Customers. We know of 1,779 live websites using WP Subscribe and an additional 4,440 sites that used WP Subscribe historically and 976 websites in the United States.
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Get a list of 6,219 websites using WP Subscribe which includes location information, hosting data, contact details, 1,779 currently live websites and an additional 400 domains that redirect to sites in this list. 4,440 sites that used this technology previouslyand 976 websites in the United States currently using WP Subscribe.
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