Cannot check mail with usermin after fresh virtualmin install

Hi,

i've ubuntu 10.04, fresh install, installed apache worker + php5, then used the install script of virtualmin.
Added a virtual server with default settings, now i've gone into usermin to check mail, it says:

Error - Perl execution failed

Can't use an undefined value as a symbol reference at /usr/share/usermin/mailbox/folders-lib.pl line 1983, line 1.

Now i've tried to change the usermin settings, module config->read mail and i've changed from IMAP to pop3, after inserting credentials it says:

Failed to login to POP3 server : Connection closed

Changed again to Maildir way and it works, now i've tried to send and receive mail but nothing works, it says it's correctly sent but nothing happens.

Any idea?

Here is the last part of /var/log/mail.log

Jul 28 13:24:12 km36505-04 dovecot: imap-login: Login: user=, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
Jul 28 13:28:27 km36505-04 dovecot: pop3-login: Login: user=, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
Jul 28 13:28:27 km36505-04 dovecot: POP3(aspa): mail_location not set and autodetection failed: Mail storage autodetection failed with home=/home/aspa
Jul 28 13:28:27 km36505-04 dovecot: POP3(aspa): Fatal: Namespace initialization failed
Jul 28 13:34:27 km36505-04 sm-mta[11535]: NOQUEUE: SYSERR(root): hash map "access": missing map file /etc/mail/access.db: No such file or directory
Jul 28 13:34:27 km36505-04 sm-mta[11535]: ruleset=check_relay, arg1=localhost.localdomain, arg2=127.0.0.1, relay=localhost.localdomain [127.0.0.1], reject=451 4.3.0 Temporary system failure. Please try again later.

Output of mailq command after mailing:

mailq
postqueue: warning: Mail system is down -- accessing queue directly
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
B3955E9D16C 600 Wed Jul 28 11:46:53 aspa@aspa.tk
tagliapietra.alessandro@gmail.com

2B56AE9C43D 572 Wed Jul 28 10:37:48 root
root

3295AE9C3C0 645 Wed Jul 28 10:16:09 alexnetwork@alexnetwork.it
tagliapietra.alessandro@gmail.com

25C81E9D188 1144 Wed Jul 28 10:21:14 alexnetwork@alexnetwork.it
tagliapietra.alessandro@gmail.com

78006E9D19C 1306 Wed Jul 28 11:42:46 root
root

3F8F6E9D186 600 Wed Jul 28 11:49:01 aspa@aspa.tk
tagliapietra.alessandro@gmail.com

9E547E9C362 600 Wed Jul 28 11:30:32 aspa@aspa.tk
tagliapietra.alessandro@gmail.com

EE565E9D17A 601 Wed Jul 28 11:31:33 aspa@aspa.tk
tagliapietra.alessandro@gmail.com

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