temporarily rejected RCPT <test@???>: /var/www/vhost/example.org: stat failed
Curiously, `exim4 -d -bt test@???` says that example.org is found in
the lookup, and finds the destination. Only wrong permissions come to my
mind, so I su'd to my Exim user, but the dir is readable (as expected).
I tentatively added an additional trailing slash in the path which didn't
help. What am I doing wrong?