[support] Action on user activation?

[Jens Wabnitz]

Hello,

i setup a drupal application where a users can register themselves
and get access after activation.
Now i need to perform additional actions right after the activation took
place.

The user_hook as no op for activation, also thought about adding a rule
to the user/reset form but could not find a way to it.

Any hints are appreciated.

Thanks in advance
Jens