def deps do
  [
    {:mail_in_a_box, "~> 0.2.0"}
  ]
end

#config/config.exs

...

config :mail_in_a_box, MIAB.Admin,
  admin_user: "guess@example.org",
  admin_pass: "39uq8k7SW8",
  endpoint: "https://box.example.org",
  domain: "example.org"

config :mail_in_a_box, MIAB.IMAP,
  account: "noreply@example.org",
  password: "14de0ea2-6187",
  use_ssl: false,
  incoming_mail_server: "box.example.org",
  incoming_port: 993

config :mail_in_a_box, MIAB.Sender,
  adapter: Swoosh.Adapters.SMTP,
  relay: "box.example.org",
  username: "noreply@example.org",
  password: "bbe8-33690cfbfeff",
  ssl: false,
  tls: :always,
  auth: :always,
  port: 587,
  no_mx_lookups: false,
  retries: 2

config :mail_in_a_box, MIAB.Send,
  ## Sender information
  email: "noreply@example.org",
  from: "Iranian English Learning Platform",
  org: "Iranian English Learning Mock Tests Center",
  org_email: "info@example.org",
  org_webiste: "https://example.org",
  # user email will be appended to unsub url
  unsub_url: "https://pte.example.org/api/v1/emails/unsubscribe/",
  signature: "\nRegards,\nYour English Learning Platform Team."
...

MIAB.Send.welcome(%{name: "your name", email: "you@mail.com"})