kern/55675: ZFS mounts do not work with setuid programs

[roy%marples.name@localhost]

>Number:         55675
>Category:       kern
>Synopsis:       ZFS mounts do not work with setuid programs
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 21 12:10:00 +0000 2020
>Originator:     Roy Marples
>Release:        9.99.73
>Organization:
>Environment:
NetBSD cube.marples.name 9.99.73 NetBSD 9.99.73 (GENERIC) #2: Thu Sep 17 11:52:51 BST 2020  roy%cube.marples.name@localhost:/home/roy/src/hg/src/sys/arch/amd64/compile/obj.amd64/GENERIC amd64
>Description:
Setup /var/spool on ZFS.
Send an email from a local user.
Look at console or maillog for errors like so:
postdrop: warning: mail_queue_enter: create file maildrop/899911.8834: Permission denied
>How-To-Repeat:
mailx -s test an.email@address < /tmp/email.message
>Fix:
mounting /var/spool/postfix/postdrop as tmpfs solves the issue