Sending emails with Transactional Email and Serverless using Terraform/OpenTofu

In this tutorial, you will learn how to send emails with Transactional Email and Serverless Functions using a Terraform/OpenTofu configuration file that builds your entire infrastructure, such as a Serverless Function and a website with a registration page hosted on an Object Storage bucket. It also allows you to configure SPF, DKIM, and MX records on your sending domain.

Before you start

To complete the actions presented below, you must have:

• A Scaleway account logged into the console
• Owner status or IAM permissions allowing you to perform actions in the intended Organization
• A domain name
• Installed Terraform/OpenTofu

Clone the GitHub repository

We have created a GitHub repository that contains all the code you need to deploy your infrastructure. Open a terminal and clone the repository to your local machine using the following command:

git clone https://github.com/scaleway/tutorial-tem-serverless-terraform

Files and directories

In the tutorial-tem-serverless-terraform directory, you will find three folders: infra, signup-handler, and super-product.

• The infra folder holds main.tf, the Terraform/OpenTofu configuration file used to deploy your infrastructure.
• The signup-handler folder contains the files that will configure your function. The main.go file is the entry point for your function.
• The super-product folder holds an index.html.tftpl file which is a Terraform/OpenTofu template. This file contains an HTML template for the registration page of the website we are creating. This template allows you to automatically create and configure the SPF, MX, and DKIM records needed for your domain, as well as a Serverless Function.

Build and deploy your infrastructure

1. Open a terminal and go to the tutorial-tem-serverless-terraform directory using the following command:

   cd tutorial-tem-serverless-terraform/infra

2. Run the following command to download the dependencies and initialize Terraform/OpenTofu:

   terraform init

3. Run the following command to deploy your infrastructure:

   terraform apply

4. Type your domain name when prompted to enter a value, and press Enter. You are then asked if you want to perform these actions:

   Plan: 14 to add, 0 to change, 0 to destroy.
   
    Changes to Outputs:
     + handler_url = (known after apply)
     + url         = (known after apply)
   
    Do you want to perform these actions?
     Terraform/OpenTofu will perform the actions described above.
     Only 'yes' will be accepted to approve.

5. Type "yes", then Enter. Terraform/OpenTofu will generate your resources. The following output displays once your resources are generated:

   Apply complete! Resources: 14 added, 0 changed, 0 destroyed.
   
    Outputs:
   
    handler_url = "https://temdemodct73sjr-tem-demo-signup-handler.functions.fnc.fr-par.scw.cloud"
    url = "https://tem-demo-super-product.s3-website.fr-par.scw.cloud"

Sending emails

1. Click the link that displays next to the url output. You are redirected to your newly-created website.

2. Enter your username in the Username field.

3. Enter your recipient's email address in the Email address field. For the purposes of this tutorial, we recommend you enter your own email address.

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4. Click Sign in.

5. Log in to your email address. Your email titled Welcome to my cool product! displays in your mailbox.

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