ONLY send subscription emails for these categories Will ONLY send subscription emails to these categories.

Filter the output of the subscription options appearing below the comment form.

Fires on each subscription form submission.

Filter the Subscribe to comments text appearing below the comment form.

Filter the Subscribe to blog text appearing below the comment form.

Filter the Jetpack Comment cookie domain.

Array of categories that will never trigger subscription emails. Will not send subscription emails from any post from within these categories.