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