New Member Introductions

In view of the significant number of newbies who seem to sign up and post a question straight away, only then to have to be asked in response to introduce themselves, I was wondering whether when they join they actually receive any message requesting an introduction as a matter of course, or is it just a question of relying on them reading the rules.

It's a good few years (11) since I joined so I can't remember how it worked then and it may have changed anyway, however if they are receiving a message I have to wonder why so many seem to ignore it. If they don't get such a note, would it perhaps help if they did?

I know it could be argued that it's good etiquette and they should post an introduction without being asked - I know I generally do anyway when joining a new forum, however I don't know of any other where it's essentially mandatory.