roles/debian-base/tasks/relayhost.yml

@@ -1,3 +1,7 @@
+- name: Getting service facts to check for postfix
+  service_facts:
+- when: "'postfix.service' not in ansible_facts.services"
+  block:
   - name: Install exim packages
     apt:
       name: exim4

roles/debian-host/tasks/apparmor.yml

@@ -1,3 +1,7 @@
+- name: Getting service facts to check for apparmor
+  service_facts:
+- when: "'apparmor.service' in ansible_facts.services"
+  block:
   - name: Stop AppArmor
     systemd:
       name: apparmor