Qmail can’t receive any email with error 451 qmail-spp failure: plugins/chkrcptto: child crashed (#4.3.0) (in reply to RCPT TO command))

Problem: Qmail cant receive any email. Error: 451 qmail-spp failure: plugins/chkrcptto: child crashed (#4.3.0) (in reply to RCPT TO command)) Cause: Device /dev/full is missing. #ls -al /dev/full ls: /dev/full: No suce file or directory How to fix: mknod -m 666 /dev/full c 1 7 chown root:root /dev/full