Second email not being sent after activation

When a new user signsup he gets an email saying

To activate your blog, please click the following link:
http://********************/wp-activate.php?key=3b21207b4d497d1a

After you activate, you will receive *another email* with your login.
After you activate, you can visit your blog here:
http://*******************/manojchacko/

But I never get a second email with my login ID.
Any idea why
I am using Cimy_Swift_SMTP

Thanks
Manoj