Hi,

I am currently working on Nagios Core 3.2.3 and i'm trying to setup a mail notification.

I already install postfix but i don't know exactly how to test email or send email out via Ubuntu.

Could you please advise how to with this?

here is my logfile.

root@ubuntu:~# tail -f /var/log/mail.log
Sep 4 17:16:27 ubuntu postfix/error[29734]: 12B2843C43: to=<root@mail.bfl.la>, relay=none, delay=378797, delays=378780/17/0/0, dsn=4.4.3, status=deferred (delivery temporarily suspended: Host or domain name not found. Name service error for name=mail.bfl.la type=MX: Host not found, try again)

well that's nothing to do with postfix, it can't resolve the destination domain. can you resolve it from a dig command?

Hi Chris,

after did dig command and the i got the result below but i don't know the meaning.

Please advise!

root@ubuntu:~# dig bfl.la

; <<>> DiG 9.8.1-P1 <<>> bfl.la
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 63926
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;bfl.la. IN A

;; Query time: 1833 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Sep 4 17:54:48 2012
;; MSG SIZE rcvd: 24

well your DNS just isn't working. do you have legitimate name servers defined in /etc/resolv.conf?

Hi Chris,

it is Dynamic resolv.conf file and there is a message DO NOT EDIT THIS FILE BY HAND

root@ubuntu:~# cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1

normally i was edit this file by insert DNS IP address but it always reset by itself and i don't why

Hi Chris,

when i did dig command on internally it is working.

root@ubuntu:~# dig bfl.net

; <<>> DiG 9.8.1-P1 <<>> bfl.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15366
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;bfl.net. IN A

;; ANSWER SECTION:
bfl.net. 600 IN A 10.10.40.11
bfl.net. 600 IN A 10.0.49.80
bfl.net. 600 IN A 10.10.40.3

;; Query time: 7 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Sep 4 18:30:50 2012
;; MSG SIZE rcvd: 73

right, so you presumably do NOT have a dns server running locally? Why does it say 127.0.0.1 in there? TBH I've no experience with the resolvconf tool, but looks like it comes back to the dns-nameservers setting in your interface config file:

http://www.linuxcertif.com/man/8/resolvconf/