mailer.ex

defmodule MyApp.Mailer do
  use Mailgun.Client, [
    domain: Application.fetch_env!(:my_app, :mailgun_domain),
    key: Application.fetch_env!(:my_app, :mailgun_key)
  ]

  @from "[email protected]"

  def send_test_mail(email) do
    {:ok, _} = send_email [
      to: email,
      from: @from,
      subject: "Test!",
      text: "Test from MyApp"
    ]
    :ok
  end
end