If you have registered with a valid e-mail address an e-mail
will be sent to you when your question has been answered. The
e-mail you receive will be titled "Updated answer" and have a link
to your question and the answer on it. The answer itself will not
be sent to you via e-mail. To be sure you get that e-mail, click
"Get updates" and make sure your "My settings page" has "A daily
digest of new unanswered questions in my watchlist categories and
notifications about updated answers from my watchlist."
selected.