Hi everybody I'm fighting with a terrible problem for 1 month. sometimes, when a client tried to send mails the server sends this error: Sending of message failed. The message could not be sent because connecting to SMTP server myserver.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your SMTP server setting is correct and try again, or else contact your network administrator I saw the postfix log and found that for some reason the connection is closed before the message is processed. this is a piece of the postfix log file: Nov 26 08:52:36 mail postfix/smtpd[2241]: connect from unknown[192.168.0.2] Nov 26 08:52:36 mail postfix/smtpd[2241]: lost connection after CONNECT from unknown[192.168.0.2] Nov 26 08:52:36 mail postfix/smtpd[2241]: disconnect from unknown[192.168.0.2] it means that for some reason a local client is losing the connection with myserver, then the client tries to send 3 more times (or so) before the message is sent, and in the worst cases I restart the whole mail server (reboot de server). this is appending once a day... lately .... and I'm so Here is a larger piece of the postfix log file: Nov 26 08:55:07 mail postfix/smtpd[2342]: connect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2342]: lost connection after CONNECT from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2342]: disconnect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2291]: connect from unknown[125.134.123.148] Nov 26 08:55:07 mail postfix/smtpd[2291]: lost connection after CONNECT from unknown[125.134.123.148] Nov 26 08:55:07 mail postfix/smtpd[2291]: disconnect from unknown[125.134.123.148] Nov 26 08:55:07 mail postfix/smtpd[2342]: connect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2342]: lost connection after CONNECT from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2342]: disconnect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2291]: connect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2291]: lost connection after CONNECT from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2291]: disconnect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2342]: connect from unknown[192.168.0.2] Nov 26 08:55:07 mail postfix/smtpd[2342]: lost connection after CONNECT from unknown[192.168.0.2] Nov 26 08:55:07 mail postfix/smtpd[2342]: disconnect from unknown[192.168.0.2] Nov 26 08:55:07 mail postfix/smtpd[2342]: connect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2342]: lost connection after CONNECT from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2342]: disconnect from unknown[87.226.180.6] Nov 26 08:55:07 mail postfix/smtpd[2295]: disconnect from unknown[125.134.123.148] Nov 26 08:55:07 mail postfix/smtpd[2291]: warning: 62.105.25.12: hostname adsl-ppp-12.reus.ru verification failed: Host not found Nov 26 08:55:07 mail postfix/smtpd[2291]: connect from unknown[62.105.25.12] Nov 26 08:55:07 mail postfix/smtpd[2291]: lost connection after CONNECT from unknown[62.105.25.12] Nov 26 08:55:07 mail postfix/smtpd[2291]: disconnect from unknown[62.105.25.12] Nov 26 08:55:07 mail postfix/smtpd[2342]: warning: 62.105.25.12: hostname adsl-ppp-12.reus.ru verification failed: Host not found Nov 26 08:55:07 mail postfix/smtpd[2342]: connect from unknown[62.105.25.12] Nov 26 08:55:07 mail postfix/smtpd[2295]: warning: 62.105.25.12: hostname adsl-ppp-12.reus.ru verification failed: Host not found Nov 26 08:55:07 mail postfix/smtpd[2295]: connect from unknown[62.105.25.12] Nov 26 08:55:07 mail postfix/smtpd[2295]: lost connection after CONNECT from unknown[62.105.25.12] Nov 26 08:55:07 mail postfix/smtpd[2295]: disconnect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2291]: warning: 62.105.25.12: hostname adsl-ppp-12.reus.ru verification failed: Host not found Nov 26 08:55:08 mail postfix/smtpd[2291]: connect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2291]: lost connection after CONNECT from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2291]: disconnect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2295]: warning: 62.105.25.12: hostname adsl-ppp-12.reus.ru verification failed: Host not found Nov 26 08:55:08 mail postfix/smtpd[2295]: connect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2295]: lost connection after CONNECT from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2295]: disconnect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2291]: warning: 62.105.25.12: hostname adsl-ppp-12.reus.ru verification failed: Host not found Nov 26 08:55:08 mail postfix/smtpd[2291]: connect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2291]: lost connection after CONNECT from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2291]: disconnect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2295]: warning: 62.105.25.12: hostname adsl-ppp-12.reus.ru verification failed: Host not found Nov 26 08:55:08 mail postfix/smtpd[2295]: connect from unknown[62.105.25.12] Nov 26 08:55:08 mail postfix/smtpd[2295]: lost connection after CONNECT from unknown[62.105.25.12] It seem that the postfix is rejecting either internal an external mails here's is my postfix configuration (postconf -n) alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, ldap:ldapaliases body_checks = pcre:/etc/postfix/body_checks canonical_maps = hash:/etc/postfix/canonical command_directory = /usr/sbin daemon_directory = /usr/lib/postfix debug_peer_level = 2 default_destination_concurrency_limit = 10 default_privs = nobody defer_transports = disable_dns_lookups = no header_checks = pcre:/etc/postfix/header_checks local_destination_concurrency_limit = 2 mail_name = Postfix on SuSE Linux eMail Server 3.1 mail_owner = postfix mailbox_transport = lmtp:unixublic/lmtp masquerade_domains = $mydomain masquerade_exceptions = root maximal_queue_lifetime = 2d message_size_limit = 10485760 mydestination = $mydomain, $myhostname, localhost.$mydomain, [190.129.91.2] myhostname = mail.bago.com.bo myorigin = $mydomain program_directory = /usr/lib/postfix queue_directory = /var/spool/postfix recipient_delimiter = + relayhost = relocated_maps = hash:/etc/postfix/relocated sender_canonical_maps = ldap:ldapcanonical smtp_tls_loglevel = 0 smtp_tls_note_starttls_offer = yes smtp_tls_session_cache_database = sdbm:/etc/postfix/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name smtpd_client_restrictions = permit_sasl_authenticated smtpd_recipient_restrictions = ldap:ldapmailenab, permit_tls_clientcerts, permit_sasl_authenticated, permit_mynetworks, check_client_access btree:/etc/postfix/dracd, check_sender_access hash:/etc/postfix/access_usernames, check_recipient_access hash:/etc/postfix/access_usernames, check_relay_domains smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous smtpd_sender_restrictions = hash:/etc/postfix/access_usernames smtpd_tls_ask_ccert = yes smtpd_tls_received_header = yes smtpd_tls_session_cache_database = sdbm:/etc/postfix/smtpd_scache tls_daemon_random_source = dev:/dev/urandom tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport virtual_maps = hash:/etc/postfix/virtual, ldap:ldapvuser and this is my master.cf smtp inet n - y - - smtpd localhost:10025 inet n - n - - smtpd -o content_filter= smtps inet n - y - - smtpd -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes pickup unix n n y 60 1 pickup cleanup unix - - y - 0 cleanup qmgr unix n - y 300 1 qmgr tlsmgr fifo - - n 300 1 tlsmgr rewrite unix - - y - - trivial-rewrite bounce unix - - y - 0 bounce defer unix - - y - 0 bounce flush unix - - n 1000? 0 flush smtp unix - - y - - smtp showq unix n - y - - showq error unix - - y - - error local unix - n n - - local lmtp unix - - y - - lmtp cyrus unix - n n - - pipe flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user} uucp unix - n n - - pipe flags=F user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient) ifmail unix - n n - - pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient) bsmtp unix - n n - - pipe flags=F. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient procmail unix - n n - - pipe flags=R user=cyrus argv=/usr/bin/procmail -t -m USER=${user} EXT=${extension} /etc/procmailrc I'll really appreciate any help Thanks in advance
What'S the output of Code: telnet localhost 25 ? Are there any other errors in your logs? What's the output of Code: postconf -d|grep mydomain ?
I run (telnet from a client PC) telnet mail.myserver.com.bo and after 45 seconds a got this message: 220 mail.myserver.com.bo ESMTP Postfix on SuSE Linux eMail Server 3.1 I also run the code: postconf -d | grep mydomain and this is the output: append_dot_mydomain = yes mydestination = $myhostname, localhost.$mydomain mydomain = mail I also verified 'myhostaname' parameter, it's set with a fqdn myhostname = mail.myserver.com.bo I checked the postfix mail log with this command: cat mail | grep -ie 'reject' -ie 'warn' -ie 'fatal' -ie ' error' and got messages like these Nov 27 00:15:12 mail postfix/smtp[25615]: 4EC5612F9DD: to=<[email protected]>, relay=mx.uol.com.br[200.221.29.129], delay=7386, status=deferred (host mx.uol.com.br[200.221.29.129] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) Nov 27 00:15:12 mail postfix/smtp[25587]: warning: no MX host for musichannel.com has a valid A record Nov 27 00:15:12 mail postfix/smtp[25587]: C60DC12FB7E: to=<[email protected]>, relay=none, delay=7299, status=deferred (Name service error for dev.null: Host not found) Nov 27 00:15:12 mail postfix/smtp[25589]: 44C9912FADF: to=<[email protected]>, relay=mx.uol.com.br[200.221.29.129], delay=7337, status=deferred (host mx.uol.com.br[200.221.29.129] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) Nov 27 00:15:12 mail postfix/smtp[25591]: 911B712F9B5: to=<[email protected]>, relay=mx.uol.com.br[200.221.29.129], delay=7408, status=deferred (host mx.uol.com.br[200.221.29.129] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) Nov 27 00:15:28 mail postfix/smtp[25331]: CAC6012F9FF: to=<[email protected]>, relay=none, delay=3501, status=deferred (Name service error for thutrang.info: Host not found, try again) Nov 27 00:16:38 mail postfix/smtpd[25694]: warning: 85.96.218.50: hostname dsl.dynamic859621850.ttnet.net.tr verification failed: Host not found Nov 27 00:17:06 mail postfix/smtpd[25710]: warning: 87.13.130.36: hostname host36-130-dynamic.13-87-r.retail.telecomitalia.it verification failed: Host not found Nov 27 00:17:44 mail postfix/smtp[25589]: D32B312FD5C: to=<[email protected]>, relay=smtp-in.his.com[216.194.216.44], delay=36, status=deferred (host smtp-in.his.com[216.194.216.44] said: 451 4.7.1 <[email protected]>: Recipient address rejected: Greylisting in effect - you can deliver your mail for capitaleducators.com in 300 seconds ...) Nov 27 00:19:26 mail postfix/smtpd[25694]: warning: 189.149.118.100: hostname dsl-189-149-118-100.prod-infinitum.com.mx verification failed: Host not found Nov 27 00:20:26 mail postfix/smtp[25181]: 735B012FE12: to=<[email protected]>, relay=barney.cair.du.edu[130.253.1.27], delay=1064, status=bounced (host barney.cair.du.edu[130.253.1.27] said: 550 5.7.1 <[email protected]>: Recipient address rejected: blocked due to excessive spam) Nov 27 00:21:02 mail postfix/smtpd[25153]: warning: 200.121.207.10: hostname client-200.121.207.10.speedy.net.pe verification failed: Host not found ... Nov 27 00:31:51 mail postfix/smtp[26115]: 5B95012F9E8: to=<[email protected]>, relay=none, delay=7775, status=deferred (Name service error for smtp: Host not found) Nov 27 00:31:51 mail postfix/smtp[26132]: A9C4212FDEA: to=<[email protected]>, relay=mx.bol.com.br[200.221.29.128], delay=3792, status=deferred (host mx.bol.com.br[200.221.29.128] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) Nov 27 00:31:54 mail postfix/smtp[26124]: A21CE12FE23: to=<[email protected]>, relay=mailer.mapfre.com.br[200.246.177.30], delay=2, status=bounced (host mailer.mapfre.com.br[200.246.177.30] said: 550 #5.1.0 Rejected by bounce verification.) Nov 27 00:31:54 mail postfix/smtp[26123]: D847C12FB4B: to=<[email protected]>, relay=none, delay=7423, status=deferred (Name service error for lifelikej.net: Host not found, try again) Nov 27 00:31:56 mail postfix/smtp[25980]: warning: no MX host for forhealthyskin.com has a valid A record Nov 27 00:31:56 mail postfix/smtp[25980]: 7900312FE07: to=<[email protected]>, relay=none, delay=3739, status=deferred (Name service error for dev.null: Host not found) Nov 27 00:31:58 mail postfix/smtp[26132]: 8748D12FE23: to=<[email protected]>, relay=mailer.mapfre.com.br[200.211.99.154], delay=2, status=bounced (host mailer.mapfre.com.br[200.211.99.154] said: 550 #5.1.0 Rejected by bounce verification.) Nov 27 00:32:01 mail postfix/smtp[26116]: 22B1012FC67: to=<[email protected]>, relay=none, delay=17674, status=deferred (Name service error for dobvod.ru: Host not found, try again) Nov 27 00:32:42 mail postfix/smtp[26116]: 0E90D12FE30: to=<[email protected]>, relay=mx5.carle.com[199.184.120.181], delay=1, status=bounced (host mx5.carle.com[199.184.120.181] said: 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown) ... Nov 27 00:37:32 mail postfix/smtpd[25985]: warning: 203.113.26.17: hostname 203-113-26-17.totisp.net verification failed: Host not found Nov 27 00:37:32 mail postfix/smtpd[25972]: warning: 203.113.26.17: hostname 203-113-26-17.totisp.net verification failed: Host not found Nov 27 00:37:35 mail postfix/smtpd[25971]: warning: 203.113.26.17: hostname 203-113-26-17.totisp.net verification failed: Host not found ... Nov 27 15:18:27 mail postfix/smtp[13244]: 1704112FE28: to=<[email protected]>, relay=mx.uol.com.br[200.221.29.129], delay=36360, status=deferred (host mx.uol.com.br[200.221.29.129] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) Nov 27 15:18:28 mail postfix/smtp[13253]: 1167912FABD: to=<[email protected]>, relay=mx.uol.com.br[200.221.29.129], delay=171420, status=deferred (host mx.uol.com.br[200.221.29.129] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) Nov 27 15:18:29 mail postfix/smtp[13277]: 6F3F912FBF9: to=<[email protected]>, relay=filter2.win.net[216.24.27.102], delay=1671, status=bounced (host filter2.win.net[216.24.27.102] said: 554 5.7.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table) Nov 27 15:18:30 mail postfix/smtp[13255]: 64CD712FB17: to=<[email protected]>, relay=mx.uol.com.br[200.221.29.129], delay=171458, status=deferred (host mx.uol.com.br[200.221.29.129] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) Nov 27 15:18:31 mail postfix/smtp[13275]: 61A4012FC19: to=<[email protected]>, relay=mx.uol.com.br[200.221.29.129], delay=82894, status=deferred (host mx.uol.com.br[200.221.29.129] said: 450 Client host rejected: cannot find your hostname, [190.129.91.2]) ... Nov 27 15:25:57 mail postfix/smtpd[13515]: warning: 201.53.170.22: hostname c935aa16.virtua.com.br verification failed: Host not found Nov 27 15:26:04 mail postfix/smtpd[13517]: warning: 201.53.170.22: hostname c935aa16.virtua.com.br verification failed: Host not found Nov 27 15:26:53 mail postfix/smtpd[13530]: warning: 201.53.170.22: hostname c935aa16.virtua.com.br verification failed: Host not found Nov 27 15:27:56 mail postfix/smtpd[13546]: warning: 75.148.0.66: hostname 75-148-0-66-WashingtonDC.hfc.comcastbusiness.net verification failed: Host not found ... Nov 27 15:11:55 mail postfix/smtp[12691]: 5CCBE12FA6C: to=<[email protected]>, relay=mfgw5.ocn.ad.jp[125.206.187.87], delay=3, status=bounced (host mfgw5.ocn.ad.jp[125.206.187.87] said: 554 5.7.1 <[email protected]>: Recipient address rejected: Access denied) Nov 27 15:12:00 mail postfix/smtp[12690]: 63DFC12FA6C: to=<[email protected]>, relay=mfgw5.ocn.ad.jp[125.206.188.198], delay=3, status=bounced (host mfgw5.ocn.ad.jp[125.206.188.198] said: 554 5.7.1 <[email protected]>: Recipient address rejected: Access denied) Nov 27 15:12:00 mail postfix/smtp[12691]: ED6D412F767: to=<[email protected]>, relay=mfgw5.ocn.ad.jp[125.206.188.199], delay=3, status=bounced (host mfgw5.ocn.ad.jp[125.206.188.199] said: 554 5.7.1 <[email protected]>: Recipient address rejected: Access denied) Nov 27 15:12:06 mail postfix/smtp[12690]: 557C412FA6C: to=<[email protected]>, relay=mfgw5.ocn.ad.jp[125.206.188.198], delay=2, status=bounced (host mfgw5.ocn.ad.jp[125.206.188.198] said: 554 5.7.1 <[email protected]>: Recipient address rejected: Access denied) ... Nov 27 15:05:14 mail postfix/qmgr[18780]: 716E612F9D0: to=<[email protected]>, relay=none, delay=77244, status=deferred (Name service error for jrtr.org: Host not found, try again) Nov 27 15:05:14 mail postfix/qmgr[18780]: 808E812F9BF: to=<[email protected]>, relay=none, delay=77230, status=deferred (Name service error for jrtr.org: Host not found, try again) no fatal errors found I just saw that postfix log has around 8000 reject or error lines over 104000 it means that around 7 percent of postfix logs implies error o reject messages I think that this is normal for a postfix with around 150 users I don't know what else to do... Any suggestion with be very appreciated thanks
Please try Code: postconf -e 'mydomain = mail.bago.com.bo' /etc/init.d/postfix restart Also, what's in /etc/resolv.conf?
Yesterday I did: postconf -e 'mydomain = mail.bago.com.bo' /etc/init.d/postfix restart same results... it still reject some clients this is the my /etc/resolv.conf domain bago.com.bo nameserver 200.87.100.10 nameserver 200.87.100.40 and this is my postfix version: postfix-20010228pl03-56 At around 3 months the ISP changed our public IP and I just found that the reverse DNS of the new public IP is not working, and There's a Lot of spam that is comming to the mail server lately... Is it posible that those problems are crashing the smtp daemons? I don't know what else todo thanks for help
That could be the problem. Please ask your ISP to update the reverse DNS. If that doesn't help, I'd try two other nameservers in /etc/resolv.conf.
