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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