i might be mistaken, but i think you are looking for “email update” options maybe.
you can get it for your blog at http://www.feedburner.com .
but only those readers who subscribe for email updates will know about new posts.
another option is, you can create a mailing list and post the url of your post in emails yourself using your email program. be careful not to be spammy though, email people whom you know beforehand, otherwise you will be interpreted as a spammer!