diff --git a/docker-compose.yml b/docker-compose.yml
index cd0514c..3bc84d2 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -54,6 +54,13 @@ services:
       - POSTAL_LNAME=Cat
       - POSTAL_PASSWORD=hDzqLsP5hEXuBinpQ3KHSknvgTxRu6
       - POSTAL_EMAIL=aleksandar@puharic.com
+      - POSTAL_SMTP_HOSTNAME=mailer.network7.nu
+      - POSTAL_SPF=spf.mailer.network7.nu
+      - POSTAL_RP=rp.mailer.network7.nu
+      - POSTAL_MX=mx.network7.nu
+      - POSTAL_UI_ADDRESS=mailer.network7.nu
+      - POSTAL_ROUTER_DOMAIN=router.mailer.network7.nu
+      - POSTAL_TRACK_DOMAIN=trx.network7.nu
     networks:
       default: { aliases: [ postal, service ] }
       client: { aliases: [ postal, mailer, mailer-service ] }
diff --git a/src/templates/postal.example.yml.j2 b/src/templates/postal.example.yml.j2
index 45c1b37..32cd01e 100644
--- a/src/templates/postal.example.yml.j2
+++ b/src/templates/postal.example.yml.j2
@@ -5,7 +5,7 @@ web_server:
 
 web:
   # The host that the management interface will be available on
-  host: postal.example.com
+  host: {{ POSTAL_UI_ADDRESS }}
   # The protocol that requests to the management interface should happen on
   protocol: https
 
@@ -46,12 +46,12 @@ dns:
   # https://github.com/atech/postal/wiki/Domains-&-DNS-Configuration for further
   # information about these.
   mx_records:
-    - mx.postal.example.com
-  smtp_server_hostname: postal.example.com
-  spf_include: spf.postal.example.com
-  return_path: rp.postal.example.com
-  route_domain: routes.postal.example.com
-  track_domain: track.postal.example.com
+    - {{ POSTAL_MX }}
+  smtp_server_hostname: {{ POSTAL_SMTP_HOSTNAME }}
+  spf_include: {{ POSTAL_SPF }}
+  return_path: {{ POSTAL_RP }}
+  route_domain: {{ POSTAL_ROUTER_DOMAIN }}
+  track_domain: {{ POSTAL_TRACK_DOMAIN }}
 
 smtp:
   # Specify an SMTP server that can be used to send messages from the Postal management
diff --git a/src/templates/postal.yml.j2 b/src/templates/postal.yml.j2
index 9daae0c..8c8bd65 100644
--- a/src/templates/postal.yml.j2
+++ b/src/templates/postal.yml.j2
@@ -1,6 +1,6 @@
 web:
   # The host that the management interface will be available on
-  host: postal.example.com
+  host: {{ POSTAL_UI_ADDRESS }}
   # The protocol that requests to the management interface should happen on
   protocol: https
 
@@ -41,12 +41,12 @@ dns:
   # https://github.com/atech/postal/wiki/Domains-&-DNS-Configuration for further
   # information about these.
   mx_records:
-    - mx.postal.example.com
-  smtp_server_hostname: postal.example.com
-  spf_include: spf.postal.example.com
-  return_path: rp.postal.example.com
-  route_domain: routes.postal.example.com
-  track_domain: track.postal.example.com
+    - {{ POSTAL_MX }}
+  smtp_server_hostname: {{ POSTAL_SMTP_HOSTNAME }}
+  spf_include: {{ POSTAL_SPF }}
+  return_path: {{ POSTAL_RP }}
+  route_domain: {{ POSTAL_ROUTER_DOMAIN }}
+  track_domain: {{ POSTAL_TRACK_DOMAIN }}
 
 smtp:
   # Specify an SMTP server that can be used to send messages from the Postal management