WordPress at a glance
filter is not described

comment_moderation_headers filter-hook . WP 2.8.0

Filters the comment moderation email headers.

Usage

add_filter( 'comment_moderation_headers', 'filter_function_name_8678', 10, 2 );
function filter_function_name_8678( $message_headers, $comment_id ){
	// filter...

	return $message_headers;
}
$message_headers(string)
Headers for the comment moderation email.
$comment_id(int)
Comment ID.

Where the hook is called

wp_notify_moderator()
wp-includes/pluggable.php 1732
$message_headers = apply_filters( 'comment_moderation_headers', $message_headers, $comment_id );

Where the hook is used (in WP core)

Does not used.