On Fri, 14 Nov 2008, Jeffrey Shawn Klotz wrote:
Sahil Tandon wrote:
Jeffrey Shawn Klotz <[EMAIL PROTECTED]> wrote:
I'm having DNS issues when delivering mail on a postfix server.
The server seems to run fine for several hours. After a while, emails
start to stay in the queue with the following error for all domains:
postqueue -p
*D63998D18BF 88122 Thu Nov 13 20:19:58 [EMAIL PROTECTED]
(Host or domain name not found. Name service error for
name=att.blackberry.net type=MX: Host not found, try again)
[EMAIL PROTECTED]
*
If I flush the queue (postqueue -f) mail starts to flow again and
continues to clear the queue for several hours.
The server does not seem to have DNS issues with other applications.
NSLookup does not seem to have issues.
What if you nslookup as the postfix user? What are the contents of your
/etc/resolv.conf? What about /etc/nsswitch.conf or /etc/hosts? See the
FAQ for clues: http://www.postfix.org/faq.html#delay.
nslookup as user postfix works correctly.
resolv.conf contains:
domain example.com
nameserver 66.7.224.17
nameserver 66.7.224.18
nameserver 12.172.185.32
nameserver 12.172.185.34
nameserver 206.13.31.12
nameserver 12.127.17.71
nameserver 12.127.16.68
nameserver 12.127.17.72
nameserver 12.127.16.67
No nsswitch.conf on this system (OSX 10.5)
Hosts file contains only info on some local hosts.
For your /etc/resolv.conf file, only the first three matter:
nameserver Name server IP address
Internet address (in dot notation) of a name server that the
resolver should query. Up to MAXNS (currently 3, see
<resolv.h>) name servers may be listed, one per keyword. If
there are multiple servers, the resolver library queries them in
the order listed. If no nameserver entries are present, the
default is to use the name server on the local machine. (The
algorithm used is to try a name server, and if the query times
out, try the next, until out of name servers, then repeat trying
all the name servers until a maximum number of retries are
made.)
