mail send error on testing mail server

Hallow guy es,

I install ispconfig correctly on opensuse 13.1 but when send mail after login squirrelmail for testing i am seeing this error.

ERROR
Message not sent.
Requested action aborted: error in processing
Server replied: 451 4.3.0 <[email protected]>: Temporary lookup failure

Please help me for solution this problem.

Thank All

 

Please check that the nameservers in /etc/resolv.conf are correct and reachable from your server.

 

Dear
My server /etc/resolv.conf output is

### /etc/resolv.conf file autogenerated by netconfig!
#
# Before you change this file manually, consider to define the
# static DNS configuration using the following variables in the
# /etc/sysconfig/network/config file:
# NETCONFIG_DNS_STATIC_SEARCHLIST
# NETCONFIG_DNS_STATIC_SERVERS
# NETCONFIG_DNS_FORWARDER
# or disable DNS configuration updates via netconfig by setting:
# NETCONFIG_DNS_POLICY=''
#
# See also the netconfig(8) manual page and other documentation.
#
# Note: Manual change of this file disables netconfig too, but
# may get lost when this file contains comments or empty lines
# only, the netconfig settings are same with settings in this
# file and in case of a "netconfig update -f" call.
#
### Please remove (at least) this line when you modify the file!
nameserver 8.8.8.8

SquirrelMail notice messages
Category: PHP, Delayed
Message: Declaration of Deliver_SMTP::initStream() should be compatible with Deliver::initStream($message, $length = 0, $host = '', $port = '', $user = '', $pass = '')
FILE: /srv/www/htdocs/squirrelmail/class/deliver/Deliver_SMTP.class.php
LINE: 541


Please help me.

Thanks for replay