diff --git a/journals/2023_02_20.md b/journals/2023_02_20.md
index 2d024d2c..3198557c 100644
--- a/journals/2023_02_20.md
+++ b/journals/2023_02_20.md
@@ -11,6 +11,13 @@
 		- Frage wird auf mehreren Leveln beantwortet.
 - Simplelogin
 	- Use to create temporary email adresses
+		- Open port in firewall
+		  ```  bash
+		  sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 80 -j ACCEPT
+		  sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 443 -j ACCEPT
+		  sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 25 -j ACCEPT
+		  sudo netfilter-persistent save
+		  ```
 		- https://github.com/simple-login/app
 			- ``` bash
 			  #  generate a private and public key for DKIM: