i have never gotten an email from my wordpress installs in regards to registration notification. i finally have found something consistant though.
if the user clicks on the activation link in the email, they get activated fine, but no email sent to admin.
if the users goes to wp-activate.php and copy/paste the activation key and click "activate", admin gets an email every time.
i've never found it to be consistent until recently when i noticed this. never had a repetable bug so i never mentioned it.
ideas why this is happening?