diff --git a/docker-compose-mysql.yaml b/docker-compose-mysql.yaml
index 4760bb4..e6f3286 100644
--- a/docker-compose-mysql.yaml
+++ b/docker-compose-mysql.yaml
@@ -61,3 +61,9 @@ services:
 
 networks:
    mailman:
+    driver: bridge
+    ipam:
+      driver: default
+      config:
+      -
+        subnet: 172.19.199.0/24
\ No newline at end of file
diff --git a/docker-compose-postorius.yaml b/docker-compose-postorius.yaml
index 8d3ab0b..cfff444 100644
--- a/docker-compose-postorius.yaml
+++ b/docker-compose-postorius.yaml
@@ -58,3 +58,9 @@ services:
 
 networks:
    mailman:
+    driver: bridge
+    ipam:
+      driver: default
+      config:
+      -
+        subnet: 172.19.199.0/24
\ No newline at end of file
diff --git a/docker-compose.yaml b/docker-compose.yaml
index 0b7a6d1..f12ab9f 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -56,4 +56,10 @@ services:
       mailman:
 
 networks:
-   mailman:
+  mailman:
+    driver: bridge
+    ipam:
+      driver: default
+      config:
+      -
+        subnet: 172.19.199.0/24
\ No newline at end of file