How to set fix toAdress in Hybris for all email?

If you want to send all emails to some fix toAddress, in that case, you need to override email and displayName in respective *EmailContext of renderer template.

Let's just assume you want to override toAddress in customer registration flow. So here you need to find context class name form Impex. Below are the renderer template for customer registration subject & body and CustomerEmailContext is the class name which will feed all data to this renderer.

# Email velocity templates     
INSERT_UPDATE RendererTemplate ; code[unique=true]                                         ; contextClass                                                                                ; rendererType(code)[default='velocity']
                               ; powertools_Email_Customer_Registration_Body               ; $emailPackageName.CustomerEmailContext                                                      
                               ; powertools_Email_Customer_Registration_Subject            ; $emailPackageName.CustomerEmailContext  

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Now open the CustomerEmailContext.java and change init method

@Override
public void init(final StoreFrontCustomerProcessModel storeFrontCustomerProcessModel, final EmailPageModel emailPageModel)
{
    super.init(storeFrontCustomerProcessModel, emailPageModel);
    String REGISTRATION_EMAIL = Config.getString("fix.registration.email.toaddress", "defaultvalue@gmail.com");
    String REGISTRATION_DISPLAYNAME = Config.getString("fix.registration.email.toaddress.displayName", "New Accounts Team");

    put(DISPLAY_NAME, REGISTRATION_DISPLAYNAME);
    put(EMAIL, REGISTRATION_EMAIL);
    customerData = getCustomerConverter().convert(getCustomer(storeFrontCustomerProcessModel));
}

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