доброго времени суток!
У меня проблема следующего характера.
При отправке писем на некоторые сервера(но не на все) происходит timeout  при доставке.
Вот такое:
(host solidbud.com[74.53.28.130] said: 421 firehawk.websitewelcome.com SMTP incoming data timeout -

closing connection. (in reply to end of DATA command))
(conversation with kms-ua.com[195.248.234.152] timed out while sending MAIL FROM)
(lost connection with mx.strefa.interia.pl[217.74.64.36] while sending message body)
(host mx2.id4.pl[194.114.145.8] said: 421 4.4.2 relay.id4.pl Error: timeout exceeded (in reply to

MAIL FROM command))
(conversation with alt1.gmail-smtp-in.l.google.com[209.85.129.114] timed out while sending end of

data -- message may be sent more than once)

Сначала думал что проблема в настройках Postfix`a и виставил вот такие значения переменных:
smtp_connect_timeout = 300s
smtp_data_done_timeout = 900s
smtp_data_init_timeout = 300s
smtp_data_xfer_timeout = 300s
smtp_helo_timeout = 300s
smtp_mail_timeout = 300s
smtp_rcpt_timeout = 300s

Но не помогло!
Начал копать в сторону настроек сети, ставил в sysctl.conf такое:
net.inet.tcp.rfc1323=0

И то не помогло.

Подскажыте пожалуйста где собака зарыта!
Спасибо!

Содержимое Maillog:

Nov 22 19:43:24 mail2 postfix/smtp[19102]: 0C0EB2848B: to=<andreygridov@gmail.com>,

relay=alt1.gmail-smtp-in.l.google.com[209.85.135.27]:25, delay=1282, delays=903/0.04/214/166,

dsn=4.4.2, status=deferred (conversation with alt1.gmail-smtp-in.l.google.com[209.85.135.27] timed

out while sending end of data -- message may be sent more than once)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: status
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: status
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: 4.4.2
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: diag_type
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: diag_type
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: (end)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: diag_text
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: diag_text
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: (end)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: mta_type
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: mta_type
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: (end)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: mta_mname
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: mta_mname
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: (end)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: action
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: action
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: (end)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: reason
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: reason
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: conversation with

alt1.gmail-smtp-in.l.google.com[209.85.135.27] timed out while sending end of data -- message may

be sent more than once
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: status
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: status
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute value: 4294967295
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: private/smtp socket: wanted attribute: (list terminator)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: input attribute name: (end)
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: qmgr_queue_throttle: queue gmail.com: 4.4.2 delivery

temporarily suspended: conversation with alt1.gmail-smtp-in.l.google.com[209.85.135.27] timed out

while sending end of data -- message may be sent more than once
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: qmgr_active_done: 0C0EB2848B
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: wakeup 0C0EB2848B after 1282 secs
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: qmgr_active_defer: defer 0C0EB2848B
Nov 22 19:43:24 mail2 postfix/qmgr[19097]: qmgr_job_free: 0C0EB2848B smtp
Nov 22 19:47:06 mail2 postfix/qmgr[19097]: trigger_server_accept_fifo: trigger arrived
Nov 22 19:47:06 mail2 postfix/qmgr[19097]: master_notify: status 0
Nov 22 19:47:06 mail2 postfix/qmgr[19097]: request: 87 (W)
Nov 22 19:47:06 mail2 postfix/qmgr[19097]: qmgr_scan_start: start incoming queue scan
Nov 22 19:47:06 mail2 postfix/qmgr[19097]: master_notify: status 1
Nov 22 19:47:06 mail2 postfix/qmgr[19097]: done incoming queue scan
Nov 22 19:52:07 mail2 postfix/qmgr[19097]: trigger_server_accept_fifo: trigger arrived
Nov 22 19:52:07 mail2 postfix/qmgr[19097]: master_notify: status 0
Nov 22 19:52:07 mail2 postfix/qmgr[19097]: request: 87 (W)
Nov 22 19:52:07 mail2 postfix/qmgr[19097]: qmgr_scan_start: start incoming queue scan
Nov 22 19:52:07 mail2 postfix/qmgr[19097]: master_notify: status 1
Nov 22 19:52:07 mail2 postfix/qmgr[19097]: done incoming queue scan
Nov 22 19:57:08 mail2 postfix/qmgr[19097]: trigger_server_accept_fifo: trigger arrived
Nov 22 19:57:08 mail2 postfix/qmgr[19097]: master_notify: status 0
Nov 22 19:57:08 mail2 postfix/qmgr[19097]: request: 87 (W)
Nov 22 19:57:08 mail2 postfix/qmgr[19097]: qmgr_scan_start: start incoming queue scan
Nov 22 19:57:08 mail2 postfix/qmgr[19097]: master_notify: status 1
Nov 22 19:57:08 mail2 postfix/qmgr[19097]: done incoming queue scan

в ето время в debug.log

Nov 20 19:52:31 mail2 freshclam[574]: Max retries == 3
Nov 20 19:52:31 mail2 freshclam[574]: Using IPv6 aware code
Nov 20 19:52:31 mail2 freshclam[574]: Querying current.cvd.clamav.net
Nov 20 19:52:31 mail2 freshclam[574]: TTL: 591
Nov 20 19:52:31 mail2 freshclam[574]: Software version from DNS: 0.95.3
Nov 20 19:52:31 mail2 freshclam[574]: main.cvd version from DNS: 51
Nov 20 19:52:31 mail2 freshclam[574]: daily.cvd version from DNS: 10052
Nov 20 19:52:31 mail2 freshclam[574]: Retrieving http://db.ua.clamav.net/daily-10052.cdiff
Nov 20 19:52:32 mail2 freshclam[574]: Trying to download http://db.ua.clamav.net/daily-10052.cdiff (IP: 83.218.226.76)
Nov 20 19:52:32 mail2 freshclam[574]: cdiff_apply: Parsed 124 lines and executed 124 commands
Nov 22 19:21:26 mail2 postfix/smtpd[18874]: sql auxprop plugin using pgsql engine
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin Parse the username admin
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin try and connect to a host
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin trying to open db 'mailbase' on host ''
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: begin transaction
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin create statement from userPassword admin mail.lemberg.ua
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin doing query select smtppassword from user_accounts where smtplogin='admin';
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin create statement from cmusaslsecretCRAM-MD5 admin mail.lemberg.ua
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin doing query select smtppassword from user_accounts where smtplogin='admin';
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: commit transaction
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin Parse the username admin
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin try and connect to a host
Nov 22 19:22:01 mail2 postfix/smtpd[18874]: sql plugin trying to open db 'mailbase' on host ''