diff --git a/postfix/init.sls b/postfix/init.sls
index aa4f885..5515ef0 100644
--- a/postfix/init.sls
+++ b/postfix/init.sls
@@ -1,5 +1,15 @@
+{% from "postfix/map.jinja" import postfix with context %}
+
 postfix:
-  pkg.installed: []
+  {% if postfix.packages is defined %}
+  pkg.installed:
+    - names:
+  {% for name in postfix.packages %}
+        - {{ name }}
+  {% endfor %}
+    - watch_in:
+      - service: postfix
+  {% endif %}
   service.running:
     - enable: True
     - require:
@@ -7,9 +17,6 @@ postfix:
     - watch:
       - pkg: postfix
 
-postfix-policyd-spf-python:
-  pkg.installed: []
-
 # manage /etc/aliases if data found in pillar
 {% if 'aliases' in pillar.get('postfix', '') %}
 /etc/aliases:
diff --git a/postfix/map.jinja b/postfix/map.jinja
new file mode 100644
index 0000000..616fa02
--- /dev/null
+++ b/postfix/map.jinja
@@ -0,0 +1,10 @@
+{% set postfix = salt['grains.filter_by']({
+    'Debian': {
+        'packages': ['postfix', 'postfix-policyd-spf-python'],
+        'service': 'postfix',
+    },
+    'Gentoo': {
+        'packages': ['mail-mta/postfix'],
+        'service': 'postfix',
+    },
+}, merge=salt['pillar.get']('postfix:lookup')) %}