$rcmail_config['imap_auth_type'] = null;

укажите

$rcmail_config['imap_auth_type'] = PLAIN;

Aug  9 10:27:04 mx dovecot: auth: Debug: client out: CONT#0111#011PDAxNjk3MDE0NjQzMDEwODUuMTM3NjAzMzIyNEBteC5wb2ludC5sb2NhbD4=
Aug  9 10:27:04 mx dovecot: auth: Debug: client in: CONT#0111#011Y2VudG9zQGRvbWFpbi51YSA1ZjU1MTkwMWYyYzc4NGRkZTFhMmJkNzM4YWNjZmU1Yw==
Aug  9 10:27:04 mx dovecot: auth: Debug: sql(centos@domain.ua,10.10.4.76): query: SELECT username as user, password, '/var/vmail/domain.ua/centos' as userdb_home, 'maildir:/var/vmail/domain.ua/centos' as userdb_mail, 501 as userdb_uid, 12 as userdb_gid FROM mailbox WHERE username = 'centos@domain.ua' AND active = '1'
Aug  9 10:27:04 mx dovecot: auth: password(centos@domain.ua,10.10.4.76): Requested CRAM-MD5 scheme, but we have only MD5 (input: $1$4c8b2163$EfBZDePlp9OqK87t19k.10)
Aug  9 10:27:06 mx dovecot: auth: Debug: client out: FAIL#0111#011user=centos@domain.ua
Aug  9 10:27:06 mx dovecot: imap-login: Disconnected (auth failed, 1 attempts): user=<centos@domain.ua>, method=CRAM-MD5, rip=10.10.4.76, lip=10.10.4.76, secured

Меня смущает вот эта строчка. Как это убрать? я так понимаю, это связано с довекотом
Requested CRAM-MD5 scheme, but we have only MD5 (input: $1$4c8b2163$EfBZDePlp9OqK87t19k.10)

Вот мои конфиги
mysql -u root -p
mysql>  Enter password: *****
mysql>  CREATE DATABASE mail;
mysql>  GRANT ALL PRIVILEGES ON mail.* TO 'postfix'@'localhost' IDENTIFIED BY 'postfix';
mysql>  quit

nano /etc/postfix/main.cf
soft_bounce = no
queue_directory = /var/spool/postfix
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
default_privs = nobody
inet_interfaces = all
myhostname = mx.point.local
mydomain = point.local
myorigin = $mydomain
mydestination = $myhostname,localhost.$myhostname,localhost
local_recipient_maps = $virtual_mailbox_maps, $virtual_alias_maps, $transport_maps
unknown_local_recipient_reject_code = 550
mynetworks = 127.0.0.0/8
relay_domains = $transport_maps
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mail_spool_directory = /var/mail
smtpd_banner = $myhostname ESMTP
debug_peer_level = 2
debug_peer_list = 127.0.0.1
debugger_command =
    PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
    xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail
mailq_path = /usr/bin/mailq
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/local/man
config_directory = /etc/postfix
virtual_mailbox_domains = mysql:$config_directory/sql/vdomains.cf
virtual_mailbox_base = /var/vmail
virtual_mailbox_maps = mysql:$config_directory/sql/vmailbox.cf
virtual_alias_maps = mysql:$config_directory/sql/valias.cf
virtual_minimum_uid = 501
virtual_uid_maps = static:501
virtual_gid_maps = static:12
virtual_transport = dovecot
dovecot_destination_recipient_limit = 1
smtpd_sasl_auth_enable = yes
smtpd_sasl_exceptions_networks = $mynetworks
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = /var/spool/postfix/private/dovecot-auth
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, permit
smtpd_recipient_restrictions = permit_mynetworks,
    permit_sasl_authenticated,
    reject_unauth_destination,
    reject_non_fqdn_recipient,
    reject_unverified_recipient,
    reject_rbl_client cbl.abuseat.org,
    reject_rbl_client dialups.mail-abuse.org

Отключил селинукс и iptables
Создал юзера vmail с PID 501, группа mail c PID 12
mkdir -p -v /var/vmail
chmod 770 -R /var/vmail
chown vmail:mail /var/vmail

Создал дополнительные конфигурационные файлы, которые указаны в /etc/postfix/main.cf
# mkdir /etc/postfix/sql

vi /etc/postfix/sql/vdomains.cf
user = postfix
password = postfix
hosts = localhost
dbname = mail
table = domain
select_field = domain
where_field = domain
additional_conditions = and backupmx = '0' and active = '1'
#query = SELECT domain FROM domain WHERE domain='%s' AND backupmx='0' AND active='1'

vi /etc/postfix/sql/vmailbox.cf
user = postfix
password = postfix
hosts = localhost
dbname = mail
table = mailbox
select_field = CONCAT(domain,'/',maildir)
where_field = username
additional_conditions = and active = '1'
#query = SELECT CONCAT(domain,'/',maildir) FROM mailbox WHERE username='%s'AND active = '1'

vi /etc/postfix/sql/valias.cf
user = postfix
password = postfix
hosts = localhost
dbname     = mail
table = alias
select_field = goto
where_field = address
additional_conditions = and active = '1'
#query = SELECT goto FROM alias WHERE address='%s' AND active = '1'

vi /etc/postfix/master.cf
dovecot    unix    -    n    n    -    -    pipe
             flags=DRhu user=vmail:mail argv=/usr/libexec/dovecot/deliver -d $(recipient)

Конфигурируем Dovecot
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login cram-md5
auth_verbose = yes
base_dir = /var/run/dovecot/
disable_plaintext_auth = no
ssl = no
first_valid_uid = 501
last_valid_uid = 501
log_timestamp = %Y-%m-%d %H:%M:%S
mail_debug = yes
mail_location = maildir:/var/vmail/%d/%u
passdb {
args = /etc/dovecot-sql.conf
driver = sql
}
protocols = imap pop3
service auth {
unix_listener /var/spool/postfix/private/dovecot-auth {
user = postfix
group = postfix
mode = 0660
}
unix_listener auth-master {
user = vmail
group = mail
mode = 0660
}
unix_listener auth-userdb {
user = vmail
group = mail
mode = 0660
}
#user=root
}
service imap-login {
executable = /usr/libexec/dovecot/imap-login
inet_listener imap {
address = *
port = 143
}
}
service imap {
executable = /usr/libexec/dovecot/imap
}
service pop3-login {
executable = /usr/libexec/dovecot/pop3-login
inet_listener pop3 {
address = *
port = 110
}
}
service pop3 {
executable = /usr/libexec/dovecot/pop3
}
userdb {
args = /etc/dovecot-sql.conf
driver = sql
}

Cоздал файл /etc/dovecot-sql.conf
# vi /etc/dovecot-sql.conf
driver = mysql
connect = host=localhost dbname=mail user=postfix password=password
default_pass_scheme = MD5
user_query = SELECT '/var/vmail/%d/%n' as home, 'maildir:/var/vmail/%d/%n'as mail, 501 AS uid, 12 AS gid, concat('dirsize:storage=', quota) AS quota FROM mailbox WHERE username = '%u' AND active = '1'
password_query = SELECT username as user, password, '/var/vmail/%d/%n' as userdb_home, 'maildir:/var/vmail/%d/%n' as userdb_mail, 501 as userdb_uid, 12 asuserdb_gid FROM mailbox WHERE username = '%u' AND active = '1'

Записал в:
/etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=mx.point.local

/etc/hosts
10.10.4.76 mx.point.local mx

/etc/resolv.conf
nameserver 10.10.4.76

/etc/named.conf Добавил доманы
zone "point.local" {
        type master;
        file "point.local.fwd";
};

zone "1.168.192.in-addr.arpa" {
        type master;
        file "point.local.rev";
};

и зоны
/var/named/point.local.fwd
$TTL 7200

@    SOA             mx.point.local.     root.point.local. (12 4h 1h 1w 1h)
@    IN    NS              mx.point.local.
@    IN    MX 10           mail.point.local.

mx.point.local.    IN       A    10.10.4.76
www             IN    A    10.10.4.76
mail            IN    A    10.10.4.76

nano /var/named/point.local.rev
$TTL 7200
@    SOA         mx.point.local.    root.point.local. (12 4h 1h 1w 1h)
@    IN      NS      mx.point.local.
2    IN      PTR     mx.point.local.

Ребята, кто в этом разбераеться - помогите пожалуйста