From: {$engine_name} <support@{$engine_name}>
To: {$email}
Subject: Your username/email address has been changed at {$engine_name}

Dear customer,

Your username/email address has been changed. The current username 
and email address are

Username: {$usrname} 
Email address: {$your_email}

If you want to change them again in the future, please go to "update 
my account" after login.

Customer service
http://www.{$engine_name}