added some links

Author: johann8

README.md

@@ -310,5 +310,17 @@ ${_HOST}.@${_DOMAIN}.de -> [email protected]
 echo "Test mail from postfix" | mail -s "Test Postfix" root
 echo "Test mail from postfix" | mail -s "Test Postfix" [email protected]
 ```
+## <!-- Adds a thin line break separator style -->
+
+> [!TIP]
+> Be sure to read [our documentation][documentation::web]. It provides guidance on initial setup of your mail server.
+
+> [!IMPORTANT]
+> If you have issues, please search through [the documentation][documentation::web] **for your version** before opening an issue.
+> 
+> The issue tracker is for issues, not for personal support.  
+> Make sure the version of the documentation matches the image version you're using!
+
+## :link: Links to Useful Resources
 
 Enjoy!