just configure mail server and discover next problem
with next command
Code:
$ mail
mail: /var/mail/alexandr: Too many levels of symbolic links
so, how can I test local delivery???

Little research:
Code:
$ ls -la /var/mail 
lrwxrwxrwx 1 root root 10 2009-11-06 23:59 /var/mail -> spool/mail
$ ls -la /var/spool/mail
lrwxrwxrwx 1 root root 7 2009-11-06 23:11 /var/spool/mail -> ../mail
look like circle

solution is pretty simple:
Code:
$ sudo rm /var/mail
[sudo] password for USER: 
$ sudo mkdir /var/mail
$ sudo chgrp mail /var/mail
results:
Code:
$ mail
No mail for USER