Quoting Hisashi T Fujinaka (htodd@twofifty.com):
> Shouldn't the owner of /var/spool/mqueue be smmsp? My daily builds of
> current keep changing it to root.
> 
> My sendmail keeps complaining, and I keep switching it back.

I suspect you are using 8.12 (which is lovely and fine), but
NetBSD came with, and mtree and such expect) 8.11.

"fix" mtree and you'll likely be better.