mobilizon/docs/administration/configure/email.md

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# Email
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.
```elixir
config :mobilizon, Mobilizon.Web.Email.Mailer,
adapter: Bamboo.SMTPAdapter,
server: "localhost",
hostname: "localhost",
# usually 25, 465 or 587
port: 25,
username: nil,
password: nil,
# can be `:always` or `:never`
tls: :if_available,
allowed_tls_versions: [:tlsv1, :"tlsv1.1", :"tlsv1.2"],
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.