It seems that the ms-be hosts have recently been spamming the cron with some errors:
subject: Cron <root@ms-be2026> test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
body: run-parts: /etc/cron.monthly/ieee-data exited with return code 1
The same email was sent for many other ms-be hosts, including but not limited to: ms-be1022, ms-be2022, ms-be3004 (so at least one in each of those sites, but really many more).
Creating this task after a quick check with @fgiunchedi via IRC. Please followup and resolve, thanks!