• action

    jetpack_server_sandbox_init

    Fires when the server sandbox is initialized. This action is used to ensure that the server sandbox action hooks are set up only once.

  • filter

    jetpack_should_handle_idc

    Allows sites to opt in for IDC mitigation which blocks the site from syncing to WordPress.com when the home URL or site URL do not match what WordPress.com expects. The default value is either true, or the value of JETPACK_SHOULD_HANDLE_IDC constant if set.

  • action

    jetpack_set_tracks_ajax_hook

    Fires when the Tracking::ajax_tracks() callback has been hooked to the wp_ajax_jetpack_tracks action. This action is used to ensure that the callback is hooked only once.

  • filter

    jetpack_contact_form_email_headers

    Allow customizing the email headers. Warning: DO NOT add headers or header data from the form submission without proper escaping and validation, or you’re liable to allow abusers to use your site to send spam. Especially DO NOT take email addresses from the form data to add as CC or BCC headers without strictly validating each address against a list of allowed addresses.