NOTE: It about SuSE 11 !
Quick answer for impatient:
# touch /var/lib/suseRegister/neverRegisterOnBoot
The mail:
To: root Subject: Error during registration User-Agent: Heirloom mailx 12.5 7/5/10 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: root Registration failed.
It generated by cronjob /etc/cron.d/novell.com-suse_register which in my case contains:
46 14 23 * * root /usr/lib/suseRegister/bin/cron_suse_register
The script cron_suse_register checks installed product flavor and existance of /var/lib/suseRegister/neverRegisterOnBoot. If all conditions are met it run suse_register with flag --batch, what in turn generates e-mail to root with Subject.
You can remove a cronjob, but it can return back with update of suseRegister package.
Enjoy.