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Mobilizon requires a SMTP server to deliver emails. Using 3rd-party mail providers (Mandrill, SendGrid, Mailjet, …) will be possible in the future.

SMTP configuration

Mobilizon default settings assumes a SMTP server listens on localhost, port 25. To specify a specific server and credentials, you can add the following section in your prod.secret.exs file and modify credentials to your needs.

config :mobilizon, Mobilizon.Web.Email.Mailer,
  adapter: Bamboo.SMTPAdapter,
  server: "localhost",
  hostname: "localhost",
  port: 25,
  username: nil,
  password: nil,
  # can be `:always` or `:never`
  tls: :if_available,
  allowed_tls_versions: [:tlsv1, :"tlsv1.1", :"tlsv1.2"],
  # can be `true`
  ssl: false,
  retries: 1,
  # can be `true`
  no_mx_lookups: false,
  # can be `:always`. If your smtp relay requires authentication set it to `:always`.
  auth: :if_available

!!! tip The hostname option sets the FQDN to the header of your emails, its optional, but if you don't set it, the underlying gen_smtp module will use the hostname of your machine, like localhost.

You'll need to restart Mobilizon to recompile the app and apply the new settings.