get_comment_author_email()

get_comment_author_email( int|WP_Comment $comment_id ): string

function get_comment_author_email( $comment_id = 0 ) {
	$comment = get_comment( $comment_id );

	/**
	 * Filters the comment author's returned email address.
	 *
	 * @since 1.5.0
	 * @since 4.1.0 The `$comment_id` and `$comment` parameters were added.
	 *
	 * @param string     $comment_author_email The comment author's email address.
	 * @param string     $comment_id           The comment ID as a numeric string.
	 * @param WP_Comment $comment              The comment object.
	 */
	return apply_filters( 'get_comment_author_email', $comment->comment_author_email, $comment->comment_ID, $comment );
}