[PLUTO-help] Problema con postfix

[Mattia]

Salve,
Ho installato nel mio server debian, postfix + mysql per la gestione di email 
con domini virtuali, ma quando eseguo telnet ricevo questo errore:

server:~# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 server.area.loc ESMTP Postfix (Debian/GNU)
helo server
250 server.area.loc
mail from: mattiat a dacos.net
250 Ok
rcpt to: pippo a test.loc
451 <pippo a test.loc>: Temporary lookup failure
421 server.area.loc Error: timeout exceeded

La configurazione di postfix è la seguente:

config_directory = /etc/postfix
inet_interfaces = $myhostname localhost.$mydomain
mailbox_command =
mailbox_size_limit = 0
mydestination = localhost
mydomain = area.loc
myhostname = server.area.loc
mynetworks = 127.0.0.0/8
myorigin = $mydomain
recipient_delimiter = +
relay_transport = relay domains
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
unknown_local_recipient_reject_code = 450
virtual_alias_maps = mysql:/usr/local/etc/postfix/mysql_virtual_alias_maps.cf
virtual_gid_maps = static:104
virtual_mailbox_base = /usr/local/virtual
virtual_mailbox_domains = 
mysql:/usr/local/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_limit = 51200000
virtual_mailbox_maps = 
mysql:/usr/local/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 1001
virtual_transport = virtual
virtual_uid_maps = static:103

Questo è mail.log:

May  5 20:52:50 server postfix/pickup[1384]: warning: maildrop/0CEC9130A8: 
Error writing message file
May  5 20:53:50 server postfix/pickup[1384]: warning: A8645130A9: message has 
been queued for 1 days
May  5 20:53:50 server postfix/pickup[1384]: A8645130A9: uid=0 from=<root>
May  5 20:53:50 server postfix/cleanup[1387]: warning: connect to mysql server 
localhost: Can't connect to local MySQL server through socket 
'/var/run/mysqld/mysqld.sock' (2)
May  5 20:53:50 server postfix/cleanup[1387]: warning: A8645130A9: 
virtual_alias_maps map lookup problem for pippo a test.loc
May  5 20:53:50 server postfix/pickup[1384]: warning: maildrop/0CEC9130A8: 
Error writing message file
May  5 20:54:50 server postfix/pickup[1384]: warning: AAD74130A9: message has 
been queued for 1 days
May  5 20:54:50 server postfix/pickup[1384]: AAD74130A9: uid=0 from=<root>

Ho verificato anche questo:
server:/var/run/mysqld# ls -al
totale 3
drwxr-xr-x   2 mysql root  1024 2005-05-05 19:55 .
drwxr-xr-x  10 root  root  1024 2005-05-05 20:01 ..
-rw-rw----   1 mysql mysql    4 2005-05-05 19:55 mysqld.pid
srwxrwxrwx   1 mysql mysql    0 2005-05-05 19:55 mysqld.sock

L'utente postfix è creato:
postfix:x:103:104::/var/spool/postfix:/bin/false

I parametri di configurazione delle tabelle sono corretti, ma non capisco 
questo errore da cosa possa dipendere.
Gentilmente qualcuno ha idea del problema?
Ringrazio anticipatamente per qualsiasi consiglio.

Ciao
Mattia