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filter

jetpack_subscriptions_exclude_all_categories_except

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

Parameters

$args
array

Array of category slugs or ID's.

Changelog

How to use this hook

See “How to use actions and filters to customize Jetpack”.

Notes

If you’d rather not send any subscription emails by default, you can use the jetpack_subscriptions_exclude_all_categories_except filter. In the example below, we only send subscription emails if our post belongs to the “VaultPress” or “Akismet” category: 
function jetpackme_exclude_all_posts_subscriptions_except( $categories ) {
    $categories = array( 'vaultpress', 'akismet');
    return $categories;
}
add_filter( 'jetpack_subscriptions_exclude_all_categories_except', 'jetpackme_exclude_all_posts_subscriptions_except' );