Example using SMTPAdapter

Config

config :my_app, MyApp.Mailer,
  adapter: Bamboo.ConfigAdapter,
  chained_adapter: Bamboo.SMTPAdapter,
  server: "smtp.domain",
  hostname: "www.mydomain.com",
  username: "your.name@your.domain", # or {:system, "SMTP_USERNAME"}
  password: "pa55word", # or {:system, "SMTP_PASSWORD"}

Or if chained adapter is configured completely at runtime

config :my_app, MyApp.Mailer,
  adapter: Bamboo.ConfigAdapter,
  chained_adapter: Bamboo.SMTPAdapter

Delivering mail

def welcome do
  email
  |> Bamboo.ConfigAdapter.put_config(%{server: "smtp.other_domain)})
  |> Mailer.deliver_now()
end