I asked a question without subscribing, but now I'm not being notified of answers. Is there any way to subscribe so that I'll get those notifications?
I am not sure whether this is exactly what the OP wants, but there is possibility to receive notifications from your global inbox also via email. (Assuming you did not see them on the site.)
The above posts are quite old - the user interface changed a bit since then. So it does not look the same as on the screenshots you see there.
Still, you should be able to find this if you go to your profile, click on "Edit Profile & Settings" and then on "Edit Email Settings". There you can choose (among other things) whether you want to get emails about your unread inbox messages weekly/daily/every 3 hours/not at all.
Nothing built-in, but here's a simple way:
- At the bottom right of every page there is a link "question feed" to the RSS feed for new activity on that question. Get that link.
- Create an IFTTT account.
- Use the recipe RSS to email with the aforementioned RSS link.
There is also StackEye - Chrome Extension to follow users and questions on StackExchange sites, which allows you to subscribe to any questions and displays notifications within the site.