postfix+dovecot+mysql+postfixadmin

root@unandro-server:/# tail -f /var/log/mail.err
Aug 25 03:30:47 unandro-server postfix/smtpd[3840]: fatal: no SASL authentication mechanisms

root@unandro-server:/# tail -f /var/log/mail.log
Aug 25 03:39:03 unandro-server postfix/smtpd[3858]: connect from Unandro-PC[192.168.1.138]
Aug 25 03:39:03 unandro-server postfix/smtpd[3858]: warning: SASL: Connect to private/auth failed: No such file or directory
Aug 25 03:39:03 unandro-server postfix/smtpd[3858]: fatal: no SASL authentication mechanisms
Aug 25 03:39:04 unandro-server postfix/master[3578]: warning: process /usr/lib/postfix/smtpd pid 3856 exit status 1
Aug 25 03:39:04 unandro-server postfix/master[3578]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling
Aug 25 03:39:04 unandro-server postfix/master[3578]: warning: process /usr/lib/postfix/smtpd pid 3858 exit status 1

root@unandro-server:/# postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
delay_warning_time = 4h
home_mailbox = Maildir/
inet_interfaces = all
mail_spool_directory = /var/mail
mailbox_size_limit = 0
mydestination = $myhostname, localhost.$mydomain, localhost
mydomain = domain.ru
myhostname = mx.domain.ru
mynetworks = 127.0.0.0/8, 192.168.1.0/24
myorigin = $myhostname
queue_directory = /var/spool/postfix
recipient_delimiter = +
smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_non_fqdn_hostname,reject_non_fqdn_sender,reject_non_fqdn_recipient,reject_unauth_destination,reject_unauth_pipelining,reject_invalid_hostname
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
smtpd_use_tls = yes
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_gid_maps = static:506
virtual_mailbox_base = /var/mail
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 506
virtual_transport = virtual
virtual_uid_maps = static:506