Some Atmail appliances and machines may find the following similar output to their terminal, at 1-second intervals:

 atmail kernel: EDAC MC0: UE page 0x0, offset 0x0, grain 1073741824, row 5, labels ":": i3200 UET

This is caused by a kernel issue affecting CentOS and Fedora machines. You will need to disable that particular module. Open up /etc/modprobe.d/blacklist.conf, and add:

blacklist i3200_edac
Restart your machine afterward.