Package: mysql-server-5.5 Version: 5.5.44-0+deb8u1 The logrotate cron job was sending these emails from a newly built server running jessie:
/etc/cron.daily/logrotate: error: error running shared postrotate script for '/var/log/mysql.log /var/log/mysql/mysql.log /var/log/mysql/mysql-slow.log /var/log/mysql/error.log ' run-parts: /etc/cron.daily/logrotate exited with return code 1 The cause of the error was not clear. Upon investigating, I discovered that it was because the debian-sys-maint password didn't match. I had copied all the tables across from an older server, but the file /etc/mysql/debian.cnf had been generated, with a new random password, during the installation of the new server. Maybe it could give a more verbose error if the mysqladmin ping fails?