diff --git a/machine.yml b/machine.yml
index f817714..646682a 100644
--- a/machine.yml
+++ b/machine.yml
@@ -3,3 +3,13 @@
 
   vars_files:
     - secrets.yml
+
+  tasks:
+
+    # ----------------------------------------------------------------------------------------------
+    # E-mail configuration.
+    # ----------------------------------------------------------------------------------------------
+
+    - name: Install postfix
+      apt:
+        name: postfix