Avenger Permission Denied

I installed Avenger on FreeBSD 6.2 as Anti-Spam and I'm not understand
some configuration.

1- Avenger as me to create a user 'avenger' in group 'wheel' for its program, but when starts asmtpd , it runs under user: root and group: wheel . What is the utility to create this user 'avenger' then?

2- When I run a Debug Mod, I obtain a permission denied error

myserver:/etc/mail># asmtpd --avenge m...@mydomain.com
SMTP-test (6) <== 220 myserver.mydomain.net ESMTP
SMTP-test (6) ==> ehlo myserver.mydomain.net
SMTP-test (6) <== 250-myserver.mydomain.net
SMTP-test (6) <== 250 PIPELINING
SMTP-test (6) ==> mail from:<postmas...@myserver.mydomain.net>
SMTP-test (6) <== 250 ok
SMTP-test (6) ==> rcpt to:<m...@mydomain.com>
asmtpd: loading /etc/avenger/domains
db_dump185: /etc/mail/virtusertable.db: Permission denied
/etc/mail/aliases.db: Permission denied
/etc/mail/aliases.db: bad alias file
SMTP-test (6) <== 250 ok
+unknown (a11) === EOF

accepted by SMTP server:
250 ok

Ok so the error was coming from my "Other group" can't read . I have changed permission to following:

chmod r+o /etc/mail/virtusertable.db

and I obtain this:

myserver:/etc/mail># asmtpd --avenge m...@mydomain.com
SMTP-test (6) <== 220 myserver.mydomain.net ESMTP
SMTP-test (6) ==> ehlo myserver.mydomain.net
SMTP-test (6) <== 250-myserver.mydomain.net
SMTP-test (6) <== 250 PIPELINING
SMTP-test (6) ==> mail from:<postmas...@myserver.mydomain.net>
SMTP-test (6) <== 250 ok
SMTP-test (6) ==> rcpt to:<m...@mydomain.com>
asmtpd: loading /etc/avenger/domains
+unknown (a11) ==> return 250 ok
SMTP-test (6) <== 250 ok
+unknown (a11) === EOF

accepted by SMTP server:
250 ok

It could be a potential security problem if I left "Other" to read virtusertable.db . So my question is: Is there another way to fix this error without changing permission for Other to read virtusertable.db?