diff --git a/roles/mail_forwarder/molecule/default/molecule.yml b/roles/mail_forwarder/molecule/default/molecule.yml
index 72c577cdf9789289167b778aee82e3355cbc116c..0ce66b2c05205716628d04b4a45b6464a03acb55 100644
--- a/roles/mail_forwarder/molecule/default/molecule.yml
+++ b/roles/mail_forwarder/molecule/default/molecule.yml
@@ -18,12 +18,12 @@ platforms:
     groups:
       - mail-servers
       - helper
-    box: debian/contrib-stretch64
+    box: debian/contrib-buster64
     memory: 256
     cpus: 1
     interfaces:
       - auto_config: true
-        ip: 10.31.127.10
+        ip: 192.168.56.10
         network_name: private_network
         type: static
 
@@ -31,48 +31,12 @@ platforms:
     groups:
       - clients
       - helper
-    box: debian/contrib-stretch64
-    memory: 256
-    cpus: 1
-    interfaces:
-      - auto_config: true
-        ip: 10.31.127.11
-        network_name: private_network
-        type: static
-
-  - name: parameters-mandatory-stretch64
-    groups:
-      - parameters-mandatory
-    box: debian/contrib-stretch64
-    memory: 256
-    cpus: 1
-    interfaces:
-      - auto_config: true
-        ip: 10.31.127.30
-        network_name: private_network
-        type: static
-
-  - name: parameters-optional-stretch64
-    groups:
-      - parameters-optional
-    box: debian/contrib-stretch64
-    memory: 256
-    cpus: 1
-    interfaces:
-      - auto_config: true
-        ip: 10.31.127.31
-        network_name: private_network
-        type: static
-
-  - name: parameters-no-incoming-stretch64
-    groups:
-      - parameters-no-incoming
-    box: debian/contrib-stretch64
+    box: debian/contrib-buster64
     memory: 256
     cpus: 1
     interfaces:
       - auto_config: true
-        ip: 10.31.127.32
+        ip: 192.168.56.11
         network_name: private_network
         type: static
 
@@ -84,7 +48,7 @@ platforms:
     cpus: 1
     interfaces:
       - auto_config: true
-        ip: 10.31.127.20
+        ip: 192.168.56.20
         network_name: private_network
         type: static
 
@@ -96,7 +60,7 @@ platforms:
     cpus: 1
     interfaces:
       - auto_config: true
-        ip: 10.31.127.21
+        ip: 192.168.56.21
         network_name: private_network
         type: static
 
@@ -108,7 +72,7 @@ platforms:
     cpus: 1
     interfaces:
       - auto_config: true
-        ip: 10.31.127.22
+        ip: 192.168.56.22
         network_name: private_network
         type: static