​
Add npmrc file

Add .npmrc file in the root directory of your app, with the following content 
@shootmail:registry=https://registry.shootmail.app

​
Login to Shootmail registry

Run npm login in your terminal to login to the registry 
npm login --registry https://registry.shootmail.app
This will prompt you to enter username and password for the Shootmail registry. This username and password will be provided to you by Shootmail.

​
Install Shootmail email builder in your app

Run the following command in your terminal 
npm install @shootmail/email-builder
While doing npm install, you might get this message: 
This modules directory was created using the following registries configuration: {"default":"https://registry.npmjs.org/"}. The current configuration is {"default":"https://registry.npmjs.org/","@shootmail":"https://registry.shootmail.app/"}. To recreate the modules directory using the new settings, run "pnpm install".
You can safely press enter or Y to proceed further. This error message notifies you that previously, all the dependencies were downloaded from the default npm registry, but since now, they will be downloaded via Shootmail’s proxy, the node_modules folder needs to be re-built. This will not change anything.