Use meaningful email body.

strato-production.yaml

@@ -66,7 +66,7 @@
             password: "{{ mail_password }}"
             to: "{{ item.value.email }}"
             subject: Datenbank Backup
-            body: System {{ ansible_hostname }} has been successfully provisioned.
+            body: Backup der Anwendung wurde erstellt.
             attach:
             - "{{ backup_dir }}/{{ item.key }}/db-{{ ansible_date_time.iso8601_basic_short }}.sql.gz"
           when: item.value.email is defined