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postfix appears not finding MX records or host names from DNS
I am working on a test environment using a postfix server as an email gateway using the transport_maps parameter. The /etc/postfix/transport file looks like.
lornadell.com relay:[mail2.lornadell.com] This configuration above works, but if mail2.lornadell.com goes down I would then want the email to go to mail.lornadell.com. What I understand from searching around you can't have two entries like this in the transport file. lornadell.com relay:[mail2.lornadell.com] lornadell.com relay:[mail.lornadell.com] and is recommended to use MX records for this so that mail.lornadell.com would be secondary. In the above examples the brackets disables MX lookups so to get MX lookups working I modified the parameter to look like. lornadell.com relay:lornadell.com Right now I am sending an email message from the relay server itself but I also get the same results when sending messages from outside the network. --------- Here is the error message from the logs Aug 18 04:26:29 relay postfix/pickup[5294]: 592FD21E02: uid=0 from=<root> Aug 18 04:26:29 relay postfix/cleanup[5299]: 592FD21E02: message-id=<20140818042629.592FD21E02@relay> Aug 18 04:26:29 relay postfix/qmgr[5295]: 592FD21E02: from=<root@relay.localdomain>, size=419, nrcpt=1 (queue active) Aug 18 04:26:29 relay postfix/smtp[5301]: warning: no MX host for lornadell.com has a valid address record Aug 18 04:26:29 relay postfix/smtp[5301]: 592FD21E02: to=<rrangel@lornadell.com>, relay=none, delay=0.08, delays=0.06/0.02/0.01/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=mai12.lornadell.com type=A: Host not found) --------- Here is the DNS zone configuration $TTL 21600 @ IN SOA pepperrun.home.com. rrangel.lornadell.com. ( 2014081000 10800 3600 604800 10800 ) IN NS pepperrun.home.com. localhost IN A 127.0.0.1 relay IN A 192.168.1.71 mail IN A 192.168.1.72 mail2 IN A 192.168.1.73 lornadell.com. IN MX 10 mai12.lornadell.com. --------- On the relay server here is what the DNS lookup shows [root@relay postfix]# dig MX lornadell.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> MX lornadell.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29417 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;lornadell.com. IN MX ;; ANSWER SECTION: lornadell.com. 21600 IN MX 10 mai12.lornadell.com. ;; AUTHORITY SECTION: lornadell.com. 21600 IN NS pepperrun.home.com. ;; ADDITIONAL SECTION: pepperrun.home.com. 21600 IN A 192.168.1.30 ;; Query time: 48 msec ;; SERVER: 192.168.1.30#53(192.168.1.30) ;; WHEN: Mon Aug 18 04:36:39 2014 ;; MSG SIZE rcvd: 98 --- and --- root@relay postfix]# dig mail2.lornadell.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6 <<>> mail2.lornadell.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17245 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;mail2.lornadell.com. IN A ;; ANSWER SECTION: mail2.lornadell.com. 21600 IN A 192.168.1.73 ;; AUTHORITY SECTION: lornadell.com. 21600 IN NS pepperrun.home.com. ;; ADDITIONAL SECTION: pepperrun.home.com. 21600 IN A 192.168.1.30 ;; Query time: 4 msec ;; SERVER: 192.168.1.30#53(192.168.1.30) ;; WHEN: Mon Aug 18 04:37:58 2014 ;; MSG SIZE rcvd: 98 --------- And here is what the postfix config looks like alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases 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 = 192.168.1.71, localhost inet_protocols = ipv4 local_recipient_maps = mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man masquerade_domains = lornadell.com mydestination = myhostname = relay newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = lornadell.com relayhost = smtp-server.austin.rr.com sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_host_lookup = dns transport_maps = hash:/etc/postfix/transport unknown_local_recipient_reject_code = 550 |
Put all of your known hosts in the /etc/hosts file on each relevant server, and make sure that
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and I'll bet your problems go away... :) |
Typo in hostnames in zone file
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mai12 in the "MX" record Look closely and you'll see what I mean. "A" record is correct, I believe. |
Looks like Plastic Freddie's eagle eye was the answer. Being new to Postfix I was all tied up thinking there was at least one more parameter that needed setting and not really paying attention to what all my DNS testing output was showing me.
Also thanks to ceyx comment since lot of my test environments I use the short name for the hosts. |
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