Hi Dan,
Correct in all but in this case it actually was their DNS screwed up.
I use dnsmasq as my resolver. It easy to configure and quick. It also
seems to handle oversized responses as well.
Thanks.
best wishes
Tony White
On 1/05/2015 04:12, Dan McAllister wrote:
Yes, that error is usually a DNS issue -- however, sometimes it is an issue
with the QMT server's DNS resolution.
I've been through this a number of times with people -- your mail server has no need of being a DNS server as well, but
it will rely HEAVILY on whatever DNS server you provide it (usually in /etc/resolv.conf).
One popular option is pdns-resolver (available from EPEL).
- NOTE: Do not confuse pdns-recursor with pdns -- the recursor is a DNS CLIENT (lookup service), not a server... but
it's fast and efficient.
One major cause of the CNAME issue is not really based on CNAMEs at all -- rather it is a buffer overflow in the response
from the DNS authoritative server. (DNS replies are supposed to be -- oops, used to be -- limited to 5xx characters.
Newer updates to the spec have made that a larger buffer, but many DNS clients can't handle the overflow, and so error
out... and the assumption is made that it is a CNAME caused error... an assumption that is not always correct.
I hope this helps
Dan
IT4SOHO
On 4/30/2015 9:06 AM, Tony White wrote:
Hi Fabian,
Turns out it was something like that.
The DNS for the remote mail server was utterly
screwed up. After 40 minutes of testing here to
assure my client it was not my mail server, the DNS
entries for the remote magically fixed them selves
and the clients email left the queue nicely.
Thank you.
best wishes
Tony White
On 30/04/2015 22:32, Fabian Santiago wrote:
Maybe related to this:
http://serverfault.com/questions/189366/cname-lookup-failed-temporarily-4-4-3
???
-----
Sincerely,
Fabian Santiago
Sent from my iPhone
On Apr 30, 2015, at 3:52 AM, Tony White <t...@ycs.com.au> wrote:
CNAME lookup failed temporarily. (#4.4.3)
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