Is it possible to get an email when there is any activity on a question I have posted, commented, or answered?
I only see a message on the Stack Overflow site itself. I would like to be notified too.
I was initially in favour, but have reflected for a while and I think it's a bad idea:
It allows people to post a drive-by question and then suck up the answers without returning.
I got hooked on SO because I simply couldn't find an answer to my question but was sure there was one. Returning to check progress lured me in; I spotted some questions I could answer, and my reputation went up. Now I've given hours and hours to help people on a site which helped me. Email updates wouldn't have drawn me in - I'd have been able to stay away in between notifications, and the excitement of checking would be absent.
Drive-by questions upset established users.
Providing email updates would be handing a syphon to help vampires.
The RSS feed Frédéric mentions is fine, because it's not in the nature of drive-by questioners to invest time setting up a subscription, whereas a tickbox to send updates would be very easy.
There is a question feed at the bottom-right of the page:
You can use an RSS-to-email service to generate email updates from that feed.
Yes. When you post a question, check the box.
Remarkable closed mindedness from down voters. 'I wouldn't use this feature, so no-one else should have it!'