Drupal 7.16 started sending duplicate account activation emails Could anyone help me debug why Drupal is sending two account activation emails when a new user account is activated?

I also see from the rules logs, that certain workflow rules are also sending two emails for each one.

I have looked in /admin/reports/dblog but there are no errors or warnings there.

Any idea where I can start looking?

thanks,
Darren
OK, not sure what was happening there! I changed the settings on admin/config/people/accounts and removed the need to confirm email address ("Require e-mail verification when a visitor creates an account.". 

This didn't work - still duplicates being sent out when activated.

Then I de-selected "Notify user when account is activated." (Under "Account Activation" tab) and this stopped them being sent.

Then I re-enabled "Notify user when account is activated." AND modified the email template.

Now it's only sending the one email again!

For some reason, this also fixed the rule emails that were getting duplicated... Beezaaar!

Any ideas?