Mailroot issues

Hello everyone,
Just installed vexim, looks really promising so far. However, I'm having an
issue with the mailroot. I have my mailroot set to '/usr/local/mail/
('$mailroot = "/usr/local/mail/"; set in variables.php). When I created the
vexim user, i used this as its home dir. It is owned:grouped by vexim.
However, when I create domains and users within the web interface, the
folders are never created in /usr/local/mail/

I'm using vexim version 2.2.

I'm also getting errors in my apache log such as the following:
[Fri Aug 08 10:09:27 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined index:  login in /var/www/html/
mailadmin.domain.com/config/header.php on line 86, referer:
http://mailadmin.domain.com/adminuser.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined index:  domain in /var/www/html/
mailadmin.domain.com/config/variables.php on line 71, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined variable: salt in /var/www/html/
mailadmin.domain.com/adminuseraddsubmit.php on line 109, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined index:  realname in /var/www/html/
mailadmin.domain.com/config/variables.php on line 63, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined index:  localpart in /var/www/html/
mailadmin.domain.com/config/variables.php on line 65, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined variable: _SESSION in /var/www/html/
mailadmin.domain.com/config/variables.php on line 65, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined variable: _SESSION in /var/www/html/
mailadmin.domain.com/config/variables.php on line 66, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined variable: _SESSION in /var/www/html/
mailadmin.domain.com/config/variables.php on line 67, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined index:  domain in /var/www/html/
mailadmin.domain.com/config/variables.php on line 71, referer:
http://mailadmin.domain.com/adminuseradd.php
[Fri Aug 08 10:09:32 2008] [error] [client xxx.xxx.xxx.xxx] PHP Notice:
Undefined index:  login in /var/www/html/
mailadmin.domain.com/config/header.php on line 86, referer:
http://mailadmin.domain.com/adminuseradd.php

Can anyone help on what to check next?

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