diff --git a/README.md b/README.md
index a49ac5de3..1e4ba562f 100644
--- a/README.md
+++ b/README.md
@@ -74,9 +74,10 @@ Setting up DKIM is highly recommended to reduce the chance your emails ending up
 First you need to generate a private and public key for DKIM:
 
 ```bash
-openssl genrsa -out dkim.key 1024
+openssl genrsa -traditional -out dkim.key 1024
 openssl rsa -in dkim.key -pubout -out dkim.pub.key
 ```
+Note: the `-traditional` flag is only needed if using an openssl version > 3.
 
 You will need the files `dkim.key` and `dkim.pub.key` for the next steps.
 
@@ -240,7 +241,7 @@ docker run -d \
     -v $(pwd)/sl/db:/var/lib/postgresql/data \
     --restart always \
     --network="sl-network" \
-    postgres:12.1
+    postgres:13
 ```
 
 To test whether the database operates correctly or not, run the following command:
@@ -329,8 +330,8 @@ smtpd_recipient_restrictions =
    reject_unknown_recipient_domain,
    permit_mynetworks,
    reject_unauth_destination,
-   reject_rbl_client zen.spamhaus.org,
-   reject_rbl_client bl.spamcop.net,
+   reject_rbl_client zen.spamhaus.org=127.0.0.[2..11],
+   reject_rbl_client bl.spamcop.net=127.0.0.2,
    permit
 ```
 
@@ -351,7 +352,8 @@ password = mypassword
 dbname = simplelogin
 
 query = SELECT domain FROM custom_domain WHERE domain='%s' AND verified=true
-    UNION SELECT '%s' WHERE '%s' = 'mydomain.com' LIMIT 1;
+    UNION SELECT domain FROM public_domain WHERE domain='%s'
+    UNION SELECT '%s' WHERE '%s' = 'example.com' LIMIT 1;
 ```
 
 Create the `/etc/postfix/pgsql-transport-maps.cf` file with the following content.
@@ -366,7 +368,8 @@ dbname = simplelogin
 
 # forward to smtp:127.0.0.1:20381 for custom domain AND email domain
 query = SELECT 'smtp:127.0.0.1:20381' FROM custom_domain WHERE domain = '%s' AND verified=true
-    UNION SELECT 'smtp:127.0.0.1:20381' WHERE '%s' = 'mydomain.com' LIMIT 1;
+    UNION SELECT 'smtp:127.0.0.1:20381' FROM public_domain WHERE domain = '%s'
+    UNION SELECT 'smtp:127.0.0.1:20381' WHERE '%s' = 'example.com' LIMIT 1;
 ```
 
 Finally, restart Postfix
@@ -380,7 +383,7 @@ sudo systemctl restart postfix
 To run SimpleLogin, you need a config file at `$(pwd)/simplelogin.env`. Below is an example that you can use right away, make sure to
 
 - replace `mydomain.com` by your domain,
-- set `FLASK_SECRET` to a secret string,
+- set `FLASK_SECRET` to a secret string (e.g. generated by pwgen `pwgen -B -s -y 64 -N 1`),
 - update 'myuser' and 'mypassword' with your database credentials used in previous step.
 
 All possible parameters can be found in [config example](example.env). Some are optional and are commented out by default.
@@ -418,6 +421,12 @@ LOCAL_FILE_UPLOAD=1
 POSTFIX_SERVER=10.0.0.1
 ```
 
+Now it is time to build the latest docker. Replace the tag by latest version released (as of writing 4.35.2).
+```bash
+docker build https://github.com/simple-login/app.git -t simplelogin/app:tag
+```
+
+This command could take a while to build the `simplelogin/app` docker image.
 
 Before running the webapp, you need to prepare the database by running the migration:
 
@@ -430,11 +439,9 @@ docker run --rm \
     -v $(pwd)/dkim.pub.key:/dkim.pub.key \
     -v $(pwd)/simplelogin.env:/code/.env \
     --network="sl-network" \
-    simplelogin/app:3.4.0 flask db upgrade
+    simplelogin/app:4.35.2 alembic upgrade head
 ```
 
-This command could take a while to download the `simplelogin/app` docker image.
-
 Init data
 
 ```bash
@@ -445,7 +452,7 @@ docker run --rm \
     -v $(pwd)/dkim.key:/dkim.key \
     -v $(pwd)/dkim.pub.key:/dkim.pub.key \
     --network="sl-network" \
-    simplelogin/app:3.4.0 python init_app.py
+    simplelogin/app:4.35.2 python init_app.py
 ```
 
 Now, it's time to run the `webapp` container!
@@ -461,7 +468,7 @@ docker run -d \
     -p 127.0.0.1:7777:7777 \
     --restart always \
     --network="sl-network" \
-    simplelogin/app:3.4.0
+    simplelogin/app:4.35.2
 ```
 
 Next run the `email handler`
@@ -477,7 +484,7 @@ docker run -d \
     -p 127.0.0.1:20381:20381 \
     --restart always \
     --network="sl-network" \
-    simplelogin/app:3.4.0 python email_handler.py
+    simplelogin/app:4.35.2 python email_handler.py
 ```
 
 And finally the `job runner`
@@ -492,7 +499,7 @@ docker run -d \
     -v $(pwd)/dkim.pub.key:/dkim.pub.key \
     --restart always \
     --network="sl-network" \
-    simplelogin/app:3.4.0 python job_runner.py
+    simplelogin/app:4.35.2 python job_runner.py
 ```
 
 ### Nginx