SMTP

Authelia can send emails to users through an SMTP server. This section describes how to configure this.

Configuration

notifier:
  disable_startup_check: false
  smtp:
    host: 127.0.0.1
    port: 1025
    timeout: 5s
    username: test
    password: password
    sender: "Authelia <admin@example.com>"
    identifier: localhost
    subject: "[Authelia] {title}"
    startup_check_address: test@authelia.com
    disable_require_tls: false
    disable_html_emails: false
    tls:
      server_name: smtp.example.com
      skip_verify: false
      minimum_version: TLS1.2

Options

host

integer required

The hostname of the SMTP server.

If utilising an IPv6 literal address it must be enclosed by square brackets and quoted:

host: "[fd00:1111:2222:3333::1]"

port

integer required

The port the SMTP service is listening on.

timeout

duration 5s not required

The SMTP connection timeout.

username

string not required

The username sent for authentication with the SMTP server. Paired with the password.

password

string not required

Important Note: This can also be defined using a secret which is strongly recommended especially for containerized deployments.

The password paired with the username sent for authentication with the SMTP server.

It’s strongly recommended this is a Random Alphanumeric String with 64 or more characters and the user password is changed to this value.

sender

string required

The sender is used to construct both the SMTP command MAIL FROM and to add the FROM header. This address must be in RFC5322 format. This means it must one of two formats:

The MAIL FROM command sent to SMTP servers will not include the name portion, this is only set in the FROM as per specifications.

identifier

string localhost not required

The name to send to the SMTP server as the identifier with the HELO/EHLO command. Some SMTP providers like Google Mail reject the message if it’s localhost.

subject

string [Authelia] {title} not required

This is the subject Authelia will use in the email, it has a single placeholder at present {title} which should be included in all emails as it is the internal descriptor for the contents of the email.

startup_check_address

string test@authelia.com not required

Authelia checks the SMTP server is valid at startup, one of the checks requires we ask the SMTP server if it can send an email from us to a specific address, this is that address. No email is actually sent in the process. It is fine to leave this as is, but you can customize it if you have issues or you desire to.

disable_require_tls

boolean false not required

For security reasons the default settings for Authelia require the SMTP connection is encrypted by TLS. See [security] for more information. This option disables this measure (not recommended).

disable_html_emails

boolean false not required

This setting completely disables HTML formatting of emails and only sends text emails. Authelia by default sends mixed emails which contain both HTML and text so this option is rarely necessary.

tls

Controls the TLS connection validation process. You can see how to configure the tls section here.

Using Gmail

You need to generate an app password in order to use Gmail SMTP servers. The process is described here.

notifier:
  smtp:
    username: myaccount@gmail.com
    # Password can also be set using a secret: https://www.authelia.com/configuration/methods/secrets/
    password: yourapppassword
    sender: admin@example.com
    host: smtp.gmail.com
    port: 587