A New Opt-in Plugin in Town — MailOptin Plugin — WPCouple

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Source: https://managewp.org/articles/15750/a-new-opt-in-plugin-in-town-mailoptin-plugin-wpcouple

source https://williechiu40.wordpress.com/2017/07/31/a-new-opt-in-plugin-in-town-mailoptin-plugin-wpcouple/