Improve e2e tests

- Add a test for mail splitting.
- Cleanup the code, move common functionality into `common.sh`.
- Reduce noise in the test output.

e2e-tests/tests/70_mail_split.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/bash
+
+# source some functions
+. common.sh
+
+test_header "Mail split"
+
+create_unix_user karl
+KARL_FPR=$(gen_cert karl@example.com)
+authenticate $KARL_FPR
+
+create_unix_user laura
+
+echo -e "To: karl@example.com, Laura <laura@example.com>\nSubject: Testmail\n\nTestmail." | sendmail -t
+sleep 1
+
+R=1
+if [ $(expect_mail karl encrypted) == 0 ] ; then
+  if [ $(expect_mail laura unencrypted) == 0 ] ; then
+    R=0
+  fi
+fi
+
+exit $R