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I've been having an issue to send mails, mostly to domains using Outlook.com as mailserver.

For example:

Jul  5 15:38:20 vm-dns-mail postfix/smtp[29249]: B6A3A20113E: to=<[email protected]>, relay=none, delay=189023, delays=189019/0.05/4/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=grassvalley-com.mail.eo.outlook.com type=AAAA: Host not found, try again)

But it has a correct MX record:

vm-dns-mail ~/bin # dig mx grassvalley.com
[...]
;; ANSWER SECTION:
grassvalley.com.        7362    IN      MX      5 grassvalley-com.mail.eo.outlook.com.

And I can telnet to it:

vm-dns-mail ~/bin # telnet grassvalley-com.mail.eo.outlook.com 25
EHLO
Trying 207.46.163.30...
Connected to grassvalley-com.mail.eo.outlook.com.
Escape character is '^]'.
220 CO9EHSMHS019.bigfish.com Microsoft ESMTP MAIL Service ready at Fri, 5 Jul 2013 19:45:12 +0000
250-CO9EHSMHS019.bigfish.com Hello [85.12.6.130]
250-SIZE 157286400
250-PIPELINING
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH
250-8BITMIME
250-BINARYMIME
250 CHUNKING

I thought it was an IPV6 issue, as this VM is unable to connect to IPV6. So I added this line to main.cf:

inet_protocols = ipv4

But it merely changed the issue to this:

Jul  5 21:41:38 vm-dns-mail postfix/smtp[30661]: C1102201234: to=<[email protected]>, relay=none, delay=2, delays=0.01/0/2/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=cjp-be.mail.eo.outlook.com type=A: Host not found, try again)

What could cause this, rather annoying, problem?

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  • seems like a name resolution issue, check your DNS resolver on that machine.
    – topdog
    Jul 5, 2013 at 19:54
  • I was actually just looking into that, and something rather stupid seems to have fixed it... "options timeout:1 attempts:1" in resolv.conf
    – Tuinslak
    Jul 5, 2013 at 20:01

1 Answer 1

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This is what resolv.conf looked like in Postfix's chroot.

vm-dns-mail /var/spool/postfix/etc # cat resolv.conf 
options timeout:1 attempts:1
nameserver 8.8.8.8
nameserver 8.8.4.4

Removing options timeout:1 attempts:1 seems to have fixed it. Keeping that line, but adding other DNS servers (opendns for example) seems to also fix it...

I'll keep running some tests and monitor it.

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3
  • 1
    You are using Google's nameservers. If you are running a mailserver, it's better to set up your own nameserver on your system.
    – edwardmp
    Jul 5, 2013 at 22:48
  • What would be the difference ?
    – Tuinslak
    Jul 6, 2013 at 7:29
  • Most DNS based services have daily query limits meaning that if you use Google's name servers you will get locked out. The second issue is do you want this creepy company spying on your mail traffic as well ?
    – topdog
    Dec 31, 2013 at 18:00

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