diff --git a/docker/README.rst b/docker/README.rst
--- a/docker/README.rst
+++ b/docker/README.rst
@@ -695,7 +695,13 @@
    ~/swh-environment/docker$ docker-compose -f docker-compose.yml -f docker-compose.keycloak.yml up -d
    [...]
 
+User registration in Keycloak database is available by following the Register link
+in the page located at http://localhost:5080/oidc/login/.
 
+Please note that email verification is required to properly register an account.
+As we are in a testing environment, we use a MailHog instance as a fake SMTP server.
+All emails sent by Keycloak can be easily read from the MailHog Web UI located
+at http://localhost:8025/.
 
 Using Sentry
 ------------
diff --git a/docker/docker-compose.keycloak.yml b/docker/docker-compose.keycloak.yml
--- a/docker/docker-compose.keycloak.yml
+++ b/docker/docker-compose.keycloak.yml
@@ -2,6 +2,12 @@
 
 services:
 
+  mailhog:
+    image: mailhog/mailhog
+    ports:
+      - "1025:1025"
+      - "8025:8025"
+
   keycloak-db:
     image: postgres:11
     env_file:
diff --git a/docker/services/keycloak/keycloak_swh_setup.py b/docker/services/keycloak/keycloak_swh_setup.py
--- a/docker/services/keycloak/keycloak_swh_setup.py
+++ b/docker/services/keycloak/keycloak_swh_setup.py
@@ -104,6 +104,14 @@
         "loginTheme": "swh",
         "accountTheme": "swh",
         "adminTheme": "swh",
+        "registrationAllowed": True,
+        "verifyEmail": True,
+        "smtpServer": {
+            "port": "1025",
+            "host": "mailhog",
+            "from": "keycloak-swh@docker",
+            "fromDisplayName": "Keycloak SWH @ docker",
+        },
     },
     skip_exists=True,
 )