>посмотри значение smtpd_hard_error_limit
>выложи конфиг main.cf, так проще будет. main.cf:
#queue_directory = /var/spool/postfix
#command_directory = /usr/sbin
#daemon_directory = /usr/lib/postfix
queue_run_delay = 3600
maximal_queue_lifetime = 3
minimal_backoff_time = 3600
maximal_backoff_time = 7200
message_size_limit = 51200000
mail_owner = postfix
myhostname = ns4.otr.ru
mydomain = ns4.otr.ru
myorigin = $mydomain
inet_interfaces = all
mydestination = $myhostname, $myhostname.$mydomain, $mydomain, $myaltdomain, mail.$mydomain, localhost@localdo$
unknown_local_recipient_reject_code = 550
unknown_relay_recipient_reject_code = 550
unknown_address_reject_code = 550
unknown_client_reject_code = 550
unknown_hostname_reject_code = 550
mynetworks_style = subnet
smtpd_client_connection_rate_limit = 1000
smtpd_client_message_rate_limit = 1000
smtp_connection_cache_time_limit = 2
mynetworks = xxx.xxx.xxx.xxx/xx, xxx.xxx.xxx.xxx/xx
relay_domains = $mydestination, $mynetworks, $myhostname
transport_maps = hash:/etc/postfix/transport.cf
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/mail/aliases
home_mailbox = .maildir/
maildrop_destination_recipient_limit = 1
smtpd_delay_reject=yes
#smtpd_data_restrictions =
# reject_unauth_destination,
# check_policy_service inet:127.0.0.1:60000,
# permit
smtpd_helo_required = yes
smtpd_helo_restrictions =
permit_mynetworks,
reject_invalid_hostname,
# added 15.03.08
reject_unknown_hostname,
reject_non_fqdn_hostname,
#
check_helo_access hash:/etc/postfix/helo_checks_pcre
policy_time_limit=3600
smtpd_sender_restrictions =
check_policy_service unix:private/policy,
# hash:/etc/postfix/example_recipients,
permit_mynetworks,
reject_unauth_pipelining,
reject_unknown_sender_domain,
reject_non_fqdn_sender,
permit
smtpd_recipient_restrictions =
permit_mynetworks,
permit_auth_destination,
permit_mx_backup,
# check_relay_domains,
reject_non_fqdn_recipient,
reject_unknown_recipient_domain,
reject_unauth_pipelining,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_unauth_destination,
check_policy_service inet:127.0.0.1:60000,
permit
reject_rbl_client=list.dsbl.org,
reject_rbl_client=bl.spamcop.net,
reject_rbl_client=cbl.abuseat.org,
reject_rbl_client=psbl.surriel.com,
reject_rbl_client=spamsources.fabel.dk,
reject_rbl_client=opm.blitzed.org,
reject_rbl_client=combined.njabl.org,
reject_rbl_client=relays.ordb.org,
reject_rbl_client=dul.ru,
reject_rbl_client=dialup.balcklist.jippg.org,
reject_rbl_client=relays.mail-abuse.org,
reject_rbl_client=dnsbl.sorbs.net
disable_vrfy_command = yes
#header_checks = regexp:/etc/postfix/header_checks.cf
content_filter = smtp-amavis:[127.0.0.1]:10024
fast_flush_domains = $relay_domains
local_destination_concurrency_limit = 2
default_destination_concurrency_limit = 5
debug_peer_level = 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
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
#html_directory = /usr/share/doc/postfix-2.2.10/html
#manpage_directory = /usr/share/man
sample_directory = /etc/postfix
#readme_directory = /usr/share/doc/postfix-2.2.5/readme
relay_recipient_maps = hash:/etc/postfix/example_recipients
smtpd_error_sleep_time = 1s
smtpd_soft_error_limit = 10
smtpd_hard_error_limit = 20
Вариант для распечатки
OpenNET: Виртуальная конференция (Public)
(ok) on 25-Ноя-08, 18:00 
