Elixir Mailgun Client

# config/config.exs

config :my_app, mailgun_domain: "https://api.mailgun.net/v3/mydomain.com",
                mailgun_key: "key-##############"


# lib/mailer.ex
defmodule MyApp.Mailer do
  @config domain: Application.get_env(:my_app, :mailgun_domain),
          key: Application.get_env(:my_app, :mailgun_key)
  use Mailgun.Client, @config
                      

  @from "info@example.com"

  def send_welcome_text_email(user) do
    send_email to: user.email,
               from: @from,
               subject: "hello!",
               text: "Welcome!"
  end

  def send_welcome_html_email(user) do
    send_email to: user.email,
               from: @from,
               subject: "hello!",
               html: "<strong>Welcome!</strong>"
  end

 # attachments expect a list of maps. Each map should have a filename and path/content

  def send_greetings(user, file_path) do
    send_email to: user.email,
               from: @from,
               subject: "Happy b'day",
               html: "<strong>Cheers!</strong>",
               attachments: [%{path: file_path, filename: "greetings.png"}]
  end

  def send_invoice(user) do
    pdf = Invoice.create_for(user) # a string
    send_email to: user.email,
               from: @from,
               subject: "Invoice",
               html: "<strong>Your Invoice</strong>",
               attachments: [%{content: pdf, filename: "invoice.pdf"}]
  end
end


iex> MyApp.Mailer.send_welcome_text_email(user)
{:ok, ...}

Installation

Add mailgun to your mix.exs dependencies:

def deps do
  [ {:mailgun, "~> 0.1.2"} ]
end

Test mode

For testing purposes mailgun can output emails to a local file instead of actually sending them. Just set the mode configuration key to :test and the test_file_path to where you want that file to appear.

# lib/mailer.ex
defmodule MyApp.Mailer do
  @config domain: Application.get_env(:my_app, :mailgun_domain),
          key: Application.get_env(:my_app, :mailgun_key),
          mode: :test,
          test_file_path: "/tmp/mailgun.json"
  use Mailgun.Client, @config

...
end

httpc options

Under the hood the client uses httpc to call Mailgun REST API. You can inject any valid httpc options to your outbound requests by defining them within httpc_opts config entry:

# lib/mailer.ex
defmodule MyApp.Mailer do
  @config domain: Application.get_env(:my_app, :mailgun_domain),
          key: Application.get_env(:my_app, :mailgun_key),
          httpc_opts: [connect_timeout: 2000, timeout: 3000]
  use Mailgun.Client, @config
...