<https://jetpack.com/blog/how-to-use-email-subscriptions-in-jetpack-1-2/#primaryimage>
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"How to use Email Subscriptions in Jetpack 1.2"
<https://jetpack.com/blog/how-to-use-email-subscriptions-in-jetpack-1-2/?like_comment=957&_wpnonce=ca9a9c3a9c>