Enabled custom implementation for email address retrieval.

Change-Id: I9e45117dedf23c5005745ff81e60aa98bebfb34e
diff --git a/full/src/test/resources/kustvakt-test.conf b/full/src/test/resources/kustvakt-test.conf
index ca6b233..1de6cb1 100644
--- a/full/src/test/resources/kustvakt-test.conf
+++ b/full/src/test/resources/kustvakt-test.conf
@@ -18,6 +18,7 @@
 mail.enabled = false
 mail.receiver = test@localhost
 mail.sender = noreply@ids-mannheim.de
+mail.address.retrieval = test
 
 ## mail.templates
 template.group.invitation = notification.vm