open_basedir for /var/qmail/mailnames/mydomain.com

[funjoy]

On my secure server, allowing PHP to access certain directories works fine with the following method:

I add:

<Directory /var/www/vhosts/mydomain.com/httpsdocs>
php_admin_value open_basedir /home/httpd/vhosts/mydomain.com/httpsdocs:/tmp:/var/log
</Directory>

in /var/www/vhosts/mydomain.com/conf

and then run

/usr/local/psa/admin/sbin/websrvmng -u --vhost-name=mydomain.com

and then I restart apache.

It works fine for most directories (I use it to play with my logs in /var/www/vhosts/mydomain.com/statistics/logs)

However, for the directory /var/qmail/mailnames/mydomain.com it doesn't work.

Why is that?