fix nullmailer sender (#7)

Co-authored-by: Kiara Grouwstra <kiara@bij1.org>
Reviewed-on: #7

ansible/inventory/group_vars/debops_all_hosts/nullmailer.yml

@@ -1,6 +1,6 @@
 ---
 
-nullmailer__adminaddr: webmaster@bij1.org
+nullmailer__adminaddr: log@bij1.org
 
 nullmailer__remotes:
   - host: 'smtp.transip.email'
@@ -9,6 +9,4 @@ nullmailer__remotes:
     user: 'log@bij1.org'
     pass: '{{ lookup("password", secret + "/smtp/credentials/transip/log/password length=12") }}'
 
-environment__group_variables:
-  - NULLMAILER_HOST: bij1.org
-    NULLMAILER_USER: log
+nullmailer__allmailfrom: 'log@bij1.org'