Subscription plugin which supports MailChimp, Aweber and Feedburner.
https://wordpress.org/plugins/wp-subscribe/
Widgets · WordPress Plugins
Get access to data on 6,135 websites that are WP Subscribe Customers. We know of 1,831 live websites using WP Subscribe and an additional 4,304 sites that used WP Subscribe historically and 987 websites in the United States.
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Get a list of 6,135 websites using WP Subscribe which includes location information, hosting data, contact details, 1,831 currently live websites and an additional 406 domains that redirect to sites in this list. 4,304 sites that used this technology previouslyand 987 websites in the United States currently using WP Subscribe.
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