при отправке сообщений на некоторые домены возвращается отбойник cannot find your host name.

конфиг postfix:
#smtpd_recipient_restrictions = permit_mynetworks,
reject_non_fqdn_recipient,
reject_unauth_pipelining,
reject_unauth_destination,
reject_unlisted_recipient,
check_policy_service inet:127.0.0.1:10023

smtpd_recipient_restrictions =

permit_mynetworks,
sleep 5,
reject_non_fqdn_sender,
reject_unknown_sender_domain,
reject_non_fqdn_recipient,
reject_unauth_destination,
reject_unauth_pipelining,
reject_unknown_reverse_client_hostname,
reject_rbl_client dnsbl.sorbs.net,
reject_rbl_client b.barracudacentral.org,

# reject_rbl_client zen.spamhaus.org,

#smtpd_client_restrictions = permit_mynetworks,

# permit_sasl_authenticated,

# check_client_access

hash:$base/client_access,

# reject_unknown_client

Вот что говорит nslookup--

nslookup 83.xx.xx.xx

Server: 127.0.0.1

Address: 127.0.0.1#53

Non-authoritative answer:

xxx.xxx.xxx.83.in-addr.arpa name = my_domain.ru.

Authoritative answers can be found from:

83.in-addr.arpa nameserver = tinnie.arin.net.

83.in-addr.arpa nameserver = sec1.apnic.net.

83.in-addr.arpa nameserver = sunic.sunet.se.

83.in-addr.arpa nameserver = ns-pri.ripe.net.

83.in-addr.arpa nameserver = ns3.nic.fr.

83.in-addr.arpa nameserver = sec3.apnic.net.

ns3.nic.fr internet address = 192.134.0.49

ns3.nic.fr has AAAA address 2001:660:3006:1::1:1

tinnie.arin.net internet address = 199.212.0.53

tinnie.arin.net has AAAA address 2001:500:13::c7d4:35

sunic.sunet.se internet address = 192.36.125.2

sunic.sunet.se has AAAA address 2001:6b0:7::2

ns-pri.ripe.net internet address = 193.0.0.195

ns-pri.ripe.net has AAAA address 2001:610:240:0:53::3

sec1.apnic.net internet address = 202.12.29.59

sec1.apnic.net has AAAA address 2001:dc0:2001:a:4608::59

sec3.apnic.net internet address = 202.12.28.140

sec3.apnic.net has AAAA address 2001:dc0:1:0:4777::140

nslookup my_domain.ru

Server: 127.0.0.1

Address: 127.0.0.1#53

Name: my_domain.ru

Address: 83.xxx.xxx.xxx

лог файл postfix

Feb 3 20:47:28 gw postfix/smtp[82122]: B24FA72B21A:

to=<rnu@other.ru>, relay=mx2.centre.ru[194.67.34.66]:25, delay=4684,

delays=4683/0.02/0.29/0.02, dsn=4.7.1, status=deferred (host

mx2.centre.ru[194.yy.yy.yy] said: 450 4.7.1 Client host rejected:

cannot find your hostname, [83.xxx.xxx.xx] (in reply to RCPT TO

command))

Feb 3 20:49:22 gw postfix/smtp[80427]: AA2D572B166: host

shadow.other1.ru[217.yy.yy.yyy] said: 450 4.7.1 Client host rejected:

cannot find your hostname, [83.xxx.xxx.xxx] (in reply to RCPT TO

command

хотя телнет

telnet 194.xx.xx.xx 25

Trying 194.xx.xx.xx...

Connected to mx4.other_domain.ru.

Escape character is '^]'.

220 mx4.other.ru ESMTP "Other_domain.ru MailerDaemon"

helo my_domain.ru

250 mx4.other_domain.ru

mail from <admin@my_domain.ru>

250 2.1.0 Ok

dig my_domain.ru

; <<>> DiG 9.4.2 <<>> my_domain.ru

;; global options: printcmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12862

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:

;my_domain.ru. IN A

;; ANSWER SECTION:

XXX.ru. 3600 IN A 83.xxx.xxx.xxx

;; AUTHORITY SECTION:

XXX.ru. 3600 IN NS gw.my_domain.ru.

;; ADDITIONAL SECTION:

gw.XXX.ru. 3600 IN A 192.168.150.105

;; Query time: 7 msec

;; SERVER: 127.0.0.1#53(127.0.0.1)

;; WHEN: Wed Feb 3 22:16:12 2010

;; MSG SIZE rcvd: 74

вывод команды hostname

gw.my_server.ru
Где копать???