Postfix accepts mail for a long time.?

Question

Mail server

Всем Привет! С наступающими праздниками!
Под самый занавес 2015-го, возникла проблема, и решил, что в новый год надо входить без хвостов и других неприятностей.
В общем есть Postfix + Dovecot (CentOS / 6), у юзеров клиент буревестник от Мозилы.
Письма приходят очень долго, а отправляются в штатном режиме.
Вот конфа.
postconf -n

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = no
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = all
inet_protocols = ipv4
local_recipient_maps = unix:passwd.byname $alias_maps
mail_owner = postfix
mailbox_command = /usr/bin/maildrop
mailbox_size_limit = 0
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
message_size_limit = 51200000
mydestination = $myhostname, localhost.$mydomain, localhost
mydomain = localdomain
myhostname = мойсайт.ru
myorigin = мойсайт.ru
newaliases_path = /usr/bin/newaliases.postfix
non_smtpd_milters = inet:127.0.0.1:8891
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES
sample_directory = /usr/share/doc/postfix-2.6.6/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_generic_maps = hash:/etc/mail/generic
smtp_tls_CAfile = /etc/postfix/cacert.pem
smtp_tls_note_starttls_offer = yes
smtp_use_tls = yes
smtpd_client_restrictions = permit_sasl_authenticated, check_client_access hash:/etc/mail/access
smtpd_milters = inet:127.0.0.1:8891
smtpd_recipient_restrictions = permit_sasl_authenticated, check_sender_access hash:/etc/mail/access, check_client_access hash:/etc/mail/access, check_recipient_access hash:/etc/mail/access, permit_mynetworks, reject_unauth_destination, reject_unlisted_recipient, reject_unverified_recipient, check_policy_service inet:127.0.0.1:60000
smtpd_sasl_auth_enable = no
smtpd_sender_restrictions = permit_sasl_authenticated, check_sender_access hash:/etc/mail/access
smtpd_tls_CAfile = /etc/postfix/cacert.pem
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/postfix/мойсайт.ru.crt
smtpd_tls_key_file = /etc/postfix/мойсайт.ru.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
virtual_alias_domains = /etc/mail/local-host-names
virtual_alias_maps = hash:/etc/mail/virtusertable

Answer 1

СЕРЫЙ СПИСОК.