If you need to output the customer attribute value in the e-mail template, please follow the instructions:
1) Create a new email template based on the `New Account` template here: Backend - > System - > Transactional Emails - > and New Template button
2) Use the following code if you need to output customer attribute value in the email templates:
where `customer` is customer object and `attribute_code` is the code of the attribute, that was created via the `Amasty: Customer Attributes` extension.
3) Please do not forget to assign new template here: Backend - > System - > Configuration - > `Customers` section - > `Customer Configuration` tab - > `Create New Account Options` fieldset - > `Default Welcome Email` field
So you can use the `custom` method to any e-mail template, if you are sure, that the customer object is added to the e-mail.
For example, you can output customer attribute values in the order emails, because the extension is trying to add the customer object (if it exists) to the order emails.