Fires on each subscription form submission.
jetpack_subscriptions_form_submission
jetpack_subscriptions_form_submission-
action -
filter jetpack_subscriptions_exclude_all_categories_exceptONLY send subscription emails for these categories Will ONLY send subscription emails to these categories.
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filter jetpack_subscriptions_exclude_these_categoriesArray of categories that will never trigger subscription emails. Will not send subscription emails from any post from within these categories.
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filter jetpack_is_post_mailableFilter whether posts can be emailed to subscribers.
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filter jetpack_allow_per_post_subscriptionsFilter whether or not to show the per-post subscription option.
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filter infinite_scroll_creditFilter Infinite Scroll’s credit text.
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filter infinite_scroll_archive_supportedAllow plugins to filter what archives Infinite Scroll supports.
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filter infinite_scroll_allowed_varsFilter the array of allowed Infinite Scroll query arguments.
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filter infinite_scroll_resultsFilter the Infinite Scroll results.
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action infinite_scroll_emptyFires when Infinite Scoll doesn’t render any posts.
Jetpack Developer Resources 