Terraform Module to send emails using an SMTP server by calling an external email command.

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Introduction

This terraform module uses an external command using the local-exec provisioner to send emails. It's ideally suited for sending transactional emails related to the apply phase. For example, notifying a user of their IAM user account getting created or the deployment of a new ECS application.

NOTE: The null refers to the primary Terraform provider used in this module.

Dependencies

First install the latest release of the email cli tool here: https://github.com/wrouesnel/emailcli/releases

Make sure it exists in your PATH (E.g. /usr/local/bin)

We distribute an Alpine Linux package (emailcli) as part of our toolchain.

curl -sSL https://apk.cloudposse.com/install.sh | sudo bash
apk add emailcli@cloudposse

Usage

module "welcome" {
  source     = "git::https://github.com/cloudposse/terraform-null-smtp-mail.git?ref=master"
  host       = "smtp.mailgun.org"
  port       = "587"
  username   = "postmaster@ourdomain.com"
  password   = "changeme"
  from       = "admin@yourdomain.com"
  to         = ["example@yourdomain.com"]
  subject    = "Welcome $${first_name}"
  body       = "Your account has been created. Login here: $${homepage}"

  vars = {
    first_name = "Example"
    homepage   = "https://cloudposse.com"
  }
}

NOTE: Use the file(...) interpolation function to use a template file.

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

No requirements.

Providers

Name	Version
null	n/a
template	n/a

Modules

No modules.

Resources

Name	Type
null_resource.default	resource
template_file.body	data source
template_file.subject	data source

Inputs

Name	Description	Type	Default	Required
body	Email body template	any	n/a	yes
enabled	Flag to enable or disable the sending of emails	string	"true"	no
from	From address for email	any	n/a	yes
host	SMTP Host	string	"smtp.mailgun.org"	no
mail_command	Command to execute	string	"email"	no
password	Password to authenticate with the SMTP server	string	n/a	yes
port	SMTP Port	string	"587"	no
subject	Email subject template	any	n/a	yes
to	Email recipients	list(string)	n/a	yes
username	Username to authenticate with the SMTP server	string	n/a	yes
vars	Parameters to pass to the body template	map	{}	no

Outputs

Name	Description
body	Rendered body of the email
subject	Rendered subject of the email

Related Projects

Check out these related projects.

• emailcli - 12-factor compatible command line tool for sending emails that is written in Go.

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License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

Licensed to the Apache Software Foundation (ASF) under one
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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
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