Every hour, a cron job looks to see if there are any upgrades available and emails me if so. At about 11:40, I got a notification for a long list of packages, but looking at the list, they were for stretch rather than jessie, despite having jessie specified throughout /etc/apt/sources.list Sample line from the notification: "An update to exim4 from 4.84.2-2+deb8u4 to 4.89-2+deb9u1~bpo8+1 is available." Did someone upload stretch files to the jessie repository? Ian