Explain multiple entries in virtual_alias_maps via pillar.example

pillar.example

@@ -235,3 +235,24 @@ postfix:
         - someuser_1@example.com
         - someuser_2@example.com
       - singlealiasexample: someuser_3@example.com
+
+
+###
+#
+# Multiple virtual_alias_maps entries:
+#
+# You are free to define alternative mapping names
+# and use them as 'variables' in your Postfix config:
+# (Credit for the idea and the example goes to @roskens.)
+
+postfix:
+  config:
+    virtual_alias_maps: $virtual_alias_1_maps $virtual_alias_2_maps
+    virtual_alias_1_maps: hash:/etc/postfix/virtual
+    virtual_alias_2_maps: pcre:/etc/postfix/virtual.pcre
+  mapping:
+    virtual_alias_1_maps:
+      root:
+        - me
+    virtual_alias_2_maps:
+      - '/(\S+)_(devel|preprod|prod)@sub.example.com$/': '$(1)@$(2).sub.example.com'