disable_startup_check: false
    address: 'smtp://'
    timeout: '5s'
    username: 'test'
    password: 'password'
    sender: "Authelia <>"
    identifier: 'localhost'
    subject: "[Authelia] {title}"
    startup_check_address: ''
    disable_require_tls: false
    disable_starttls: false
    disable_html_emails: false
      server_name: ''
      skip_verify: false
      minimum_version: 'TLS1.2'
      maximum_version: 'TLS1.3'
      certificate_chain: |
        -----BEGIN CERTIFICATE-----
        -----END CERTIFICATE-----
        -----BEGIN CERTIFICATE-----
        -----END CERTIFICATE-----        
      private_key: |
        -----BEGIN RSA PRIVATE KEY-----
        -----END RSA PRIVATE KEY-----        


This section describes the individual configuration options.


string address required

Configures the address for the SMTP Server. The address itself is a connector and the scheme must be smtp, submission, or submissions. The only difference between these schemes are the default ports and submissions requires a TLS transport per SMTP Ports Security Measures, whereas submission and smtp use a standard TCP transport and typically enforce StartTLS.


    address: 'smtp://'
    address: 'submissions://[fd00:1111:2222:3333::1]:465'


string integer duration 5 seconds not required

The SMTP connection timeout.


string not required

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


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:

  • John Smith <>

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


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.


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.


string 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.


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).


boolean false not required

Some SMTP servers ignore SMTP specifications and claim to support STARTTLS when they in fact do not. For security reasons Authelia refuses to send messages to these servers. This option disables this measure and is enabled AT YOUR OWN RISK. It’s strongly recommended that instead of enabling this option you either fix the issue with the SMTP server’s configuration or have the administrators of the server fix it. If the issue can’t be fixed via the SMTP server configuration we recommend lodging an issue with the authors of the SMTP server.

See [security] for more information.


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.


structure tls not required

Controls the TLS connection validation parameters for either StartTLS or the TLS socket.

Using Gmail

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

    username: ''
    # Password can also be set using a secret:
    password: 'yourapppassword'
    sender: ''
    host: ''
    port: 587