Plesk qmail returns the following error:
“Deferred: 451 qmail-spp failure: plugins/chkrcptto: child crashed (#4.3.0)”
This is caused by incorrect permissions on or a missinf /dev/null device.
Remove any existing /dev/null and create a new one with the following commands.
~# mknod -m 666 /dev/full c 1 7 ~# chown root:root /dev/full
