[doc/macos] Fix cronjob setup

doc/macos.rst

@@ -191,21 +191,8 @@ updated regularly (once a week).  To do so, setup a cronjob like the following:
 
 .. code-block:: text
 
-   MAILTO=""
-   00 12 * * 0 /bin/bash /Users/admin/cron.sh
-
-
-Inside the file ``/Users/admin/cron.sh``, put the following contents:
-
-.. code-block:: sh
-
-   /bin/bash <(curl -s https://gitlab.idiap.ch/bob/bob.devtools/raw/master/doc/macos-ci-install/update-ci.sh) 2>&1 | mailx -s "Software update (hostname|cimacos)" your.email@idiap.ch
-
-.. note::
-
-   Use the program ``mailx`` instead of ``mail`` that works correctly through
-   the SMTP gateway (DMARC sign-off).  Disable cron e-mailing using
-   ``MAILTO=""`` as instructed above.  See more details in this thread:
-   https://secure.idiap.ch/bugzilla5/show_bug.cgi?id=17529
+   SHELL=/bin/bash
+   MAILTO="your.email@idiap.ch"
+   00 12 * * 0 /bin/bash <(curl -s https://gitlab.idiap.ch/bob/bob.devtools/raw/master/doc/macos-ci-install/update-ci.sh)
 
 .. include:: links.rst