Administrators can configure email for both themselves and users within a realm. This will allow Keycloak to send emails for the following tasks:
  • Verifying an email address
  • Resetting a password
  • Enabling notifications for server events

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Configuring email settings for a realm

To enable Keycloak to send emails, you need to provide Keycloak with your Simple Mail Transfer Protocol (SMTP) server settings.
  1. Log in to the Keycloak administrative console.
  2. Verify that you are on the master realm.
  3. Select Realm Settings from the left-hand navigation.
  4. Select the Email tab.
  5. Enter your SMTP server information and configure your settings as needed:
    • From: Address used for the From SMTP-Header for emails sent.
    • From display name: Configure a user-friendly email address alias. If not set, the standard From email address will be displayed.
    • Reply to: Address used for the Reply-To SMTP-Header for emails sent. If not set, the standard From email address will be displayed.
    • Reply to display name: Configure a user-friendly email address alias. If not set, the standard Reply-To email address will be displayed.
    • Envelope from: Return address used for the Return-Path SMTP-Header for emails sent.
    • Host: SMTP server hostname used for sending emails.
    • Port: SMTP server port.
      You will most likely need to update the Port to 465. This is the default port for SSL/TLS.
    • Enable SSL and Enable Start TLS: Select these checkboxes to enable username and password recovery emails to be sent by Keycloak, especially if the SMTP server is on an external network.
    • Authentication: Enable this setting if your SMTP server requires authentication. When prompted, supply the username and password.
      The value of the Password field can refer a value from an external vault.

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Gmail configuration

To configure an admin Gmail account:
  1. In Realm Settings, fill in the fields as follows:
    • From: Admin email address
    • Host: smtp.gmail.com
    • Port: 587 (for SSL, use 465)
    • Enable StartTLS: selected (for SSL, use Enable SSL)
    • Enable Authentication: selected
    • Username: Admin username
    • Password: Admin password
  2. Click Save.
  3. In a browser, log in to the Gmail account.
  4. Visit Google’s Less secure app access page, then turn on the Allow less secure apps toggle.