diff --git a/.gitmodules b/.gitmodules
index 0754cb0..9fd249d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "users-formula"]
 	path = users-formula
 	url = https://git.com.de/saltstack-formulas/users-formula.git
+[submodule "postfix-formula"]
+	path = postfix-formula
+	url = https://git.com.de/saltstack-formulas/postfix-formula.git
diff --git a/postfix-formula b/postfix-formula
new file mode 160000
index 0000000..20f210a
--- /dev/null
+++ b/postfix-formula
@@ -0,0 +1 @@
+Subproject commit 20f210a2735341154c07c2b5cddc67c73852f3f4