diff --git a/src/wp-admin/includes/schema.php b/src/wp-admin/includes/schema.php
index 5886b3d990d5d..217d18d8275a0 100644
--- a/src/wp-admin/includes/schema.php
+++ b/src/wp-admin/includes/schema.php
@@ -560,6 +560,10 @@ function populate_options( array $options = array() ) {
 
 		// 6.4.0
 		'wp_attachment_pages_enabled'     => 0,
+
+		// 6.9.0
+		'wp_notes_notify'                 => 1,
+
 	);
 
 	// 3.3.0
diff --git a/src/wp-admin/options-discussion.php b/src/wp-admin/options-discussion.php
index 7f12d95a268c4..3b4e1ac3a2313 100644
--- a/src/wp-admin/options-discussion.php
+++ b/src/wp-admin/options-discussion.php
@@ -160,6 +160,11 @@
 <label for="moderation_notify">
 <input name="moderation_notify" type="checkbox" id="moderation_notify" value="1" <?php checked( '1', get_option( 'moderation_notify' ) ); ?> />
 <?php _e( 'A comment is held for moderation' ); ?> </label>
+<br />
+<label for="wp_notes_notify">
+<input name="wp_notes_notify" type="checkbox" id="wp_notes_notify" value="1" <?php checked( '1', get_option( 'wp_notes_notify' ) ); ?> />
+<?php _e( 'Anyone posts a note' ); ?> </label>
+
 </fieldset></td>
 </tr>
 <?php $before_comment_appears_title = __( 'Before a comment appears' ); ?>
diff --git a/src/wp-admin/options.php b/src/wp-admin/options.php
index 23d0f3971ba7c..1d60fc70ec4c3 100644
--- a/src/wp-admin/options.php
+++ b/src/wp-admin/options.php
@@ -125,6 +125,7 @@
 		'comment_order',
 		'comment_registration',
 		'show_comments_cookies_opt_in',
+		'wp_notes_notify',
 	),
 	'media'      => array(
 		'thumbnail_size_w',
diff --git a/src/wp-includes/comment.php b/src/wp-includes/comment.php
index bc908326fd8a0..a6deb2db599f5 100644
--- a/src/wp-includes/comment.php
+++ b/src/wp-includes/comment.php
@@ -2425,8 +2425,9 @@ function wp_new_comment_notify_moderator( $comment_id ) {
  */
 function wp_new_comment_notify_postauthor( $comment_id ) {
 	$comment = get_comment( $comment_id );
+	$is_note = ( $comment && 'note' === $comment->comment_type );
 
-	$maybe_notify = get_option( 'comments_notify' );
+	$maybe_notify = $is_note ? get_option( 'wp_notes_notify' ) : get_option( 'comments_notify' );
 
 	/**
 	 * Filters whether to send the post author new comment notification emails,
@@ -2447,9 +2448,11 @@ function wp_new_comment_notify_postauthor( $comment_id ) {
 		return false;
 	}
 
-	// Only send notifications for approved comments.
-	if ( ! isset( $comment->comment_approved ) || '1' !== $comment->comment_approved ) {
-		return false;
+	// Send notifications for approved comments and all notes.
+	if (
+		! isset( $comment->comment_approved ) ||
+		( '1' !== $comment->comment_approved && ! $is_note ) ) {
+			return false;
 	}
 
 	return wp_notify_postauthor( $comment_id );
diff --git a/src/wp-includes/default-filters.php b/src/wp-includes/default-filters.php
index 229c9a75416af..f1cf9df7db5c6 100644
--- a/src/wp-includes/default-filters.php
+++ b/src/wp-includes/default-filters.php
@@ -522,6 +522,7 @@
 // Email notifications.
 add_action( 'comment_post', 'wp_new_comment_notify_moderator' );
 add_action( 'comment_post', 'wp_new_comment_notify_postauthor' );
+add_action( 'rest_insert_comment', array( 'WP_REST_Comments_Controller', 'wp_new_comment_via_rest_notify_postauthor' ) );
 add_action( 'after_password_reset', 'wp_password_change_notification' );
 add_action( 'register_new_user', 'wp_send_new_user_notifications' );
 add_action( 'edit_user_created_user', 'wp_send_new_user_notifications', 10, 2 );
diff --git a/src/wp-includes/pluggable.php b/src/wp-includes/pluggable.php
index 37fda9e412217..8dc41bbc4cc50 100644
--- a/src/wp-includes/pluggable.php
+++ b/src/wp-includes/pluggable.php
@@ -1894,6 +1894,20 @@ function wp_notify_postauthor( $comment_id, $deprecated = null ) {
 					$subject = sprintf( __( '[%1$s] Pingback: "%2$s"' ), $blogname, $post->post_title );
 					break;
 
+				case 'note':
+					/* translators: %s: Post title. */
+					$notify_message = sprintf( __( 'New note on your post "%s"' ), $post->post_title ) . "\r\n";
+					/* translators: 1: Note author's name, 2: Note author's IP address, 3: Note author's hostname. */
+					$notify_message .= sprintf( __( 'Author: %1$s (IP address: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
+					/* translators: %s: Note author email. */
+					$notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n";
+					/* translators: %s: Note text. */
+					$notify_message .= sprintf( __( 'Note: %s' ), "\r\n" . ( empty( $comment_content ) ? __( 'resolved/reopened' ) : $comment_content ) ) . "\r\n\r\n";
+					$notify_message .= __( 'You can see all notes on this post here:' ) . "\r\n";
+					/* translators: Note notification email subject. 1: Site title, 2: Post title. */
+					$subject = sprintf( __( '[%1$s] Note: "%2$s"' ), $blogname, $post->post_title );
+					break;
+
 				default: // Comments.
 					/* translators: %s: Post title. */
 					$notify_message = sprintf( __( 'New comment on your post "%s"' ), $post->post_title ) . "\r\n";
@@ -1917,11 +1931,15 @@ function wp_notify_postauthor( $comment_id, $deprecated = null ) {
 					break;
 			}
 
-			$notify_message .= get_permalink( $comment->comment_post_ID ) . "#comments\r\n\r\n";
 			/* translators: %s: Comment URL. */
-			$notify_message .= sprintf( __( 'Permalink: %s' ), get_comment_link( $comment ) ) . "\r\n";
+			if ( 'note' === $comment->comment_type ) {
+				$notify_message .= get_edit_post_link( $comment->comment_post_ID, 'url' ) . "\r\n";
+			} else {
+				$notify_message .= get_permalink( $comment->comment_post_ID ) . "#comments\r\n\r\n";
+				$notify_message .= sprintf( __( 'Permalink: %s' ), get_comment_link( $comment ) ) . "\r\n";
+			}
 
-			if ( user_can( $post->post_author, 'edit_comment', $comment->comment_ID ) ) {
+			if ( 'note' !== $comment->comment_type && user_can( $post->post_author, 'edit_comment', $comment->comment_ID ) ) {
 				if ( EMPTY_TRASH_DAYS ) {
 					/* translators: Comment moderation. %s: Comment action URL. */
 					$notify_message .= sprintf( __( 'Trash it: %s' ), admin_url( "comment.php?action=trash&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n";
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
index 7fe79b57c1b9b..0ef02aae4d0dc 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
@@ -36,6 +36,18 @@ public function __construct() {
 		$this->meta = new WP_REST_Comment_Meta_Fields();
 	}
 
+	/**
+	 * Send a notification to the post author when a new note is added via the REST API.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param WP_Comment $comment The comment object.
+	 */
+	public static function wp_new_comment_via_rest_notify_postauthor( $comment ) {
+		if ( 'note' === $comment->comment_type ) {
+			wp_new_comment_notify_postauthor( $comment->comment_ID );
+		}
+	}
 	/**
 	 * Registers the routes for comments.
 	 *