Undelivered Mail Returned to Sender

hi to all


This is the mail system at host dns1.domain.edu.ph.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<[email protected]>: Host or domain name not found. Name service error for
name=yahoo.com type=A: Host found but no data record of requested type


i can recieve from yahoo mail. but i can't send...


waiting for reply
knivla

 

What's in /etc/resolv.conf?

 

cat /etc/resolv.conf, big thanks falko, you made me linux user.

[root@dns1 postfix]# cat /etc/resolv.conf
search domain.edu.ph
nameserver 203.160.160.1
nameserver 203.160.160.2

 

Step by step problem

hi falko,

this is my problem. i fallowed the perfect Server 4.5 centos. everything works fine. i can send mail to internet and received.
i need to setup a mailscanner and the requirements is
sh postfix-chroot.sh enable
and i cant find the /etc/postfix/postfix-chroot.sh, so i download the rpm postfix-2.4.3-1.rhel4.i386.rpm & installed it. now the postfix-chroot.sh appear in /etc/postfix/postfix-chroot.sh and run the chroot script


[root@dns1 tmp]# rpm -Uvh postfix-2.4.3-1.rhel4.i386.rpm
Preparing... ########################################### [100%]
1ostfix ########################################### [100%]
postfix/postfix-script: warning: /var/spool/postfix/etc/passwd and /etc/passwd differ
warning: /usr/lib/sasl2/smtpd.conf saved as /usr/lib/sasl2/smtpd.conf.rpmsave


and telnet. no more plain login


[root@dns1 tmp]# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 dns1.domain.edu.ph ESMTP Postfix
ehhlo locahost
502 5.5.2 Error: command not recognized
ehlo localhost
250-dns1.domain.edu.ph
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN


all i notice is plain login is missing now.

can i install the mailscanner without using the chroot ?if will, no need to update the postfix


waiting for reply
knivla

 

Please try

Code:

nameserver 145.253.2.75
nameserver 193.174.32.18

instead.

 

+ Undelivered Mail Returned to Sender

Reporting-MTA: dns; dns1.domain.edu.ph
X-Postfix-Queue-ID: 9D3C81E40086
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Mon, 16 Jul 2007 17:34:23 +0800 (PHT)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.4.4
Diagnostic-Code: X-Postfix; Host or domain name not found. Name service error
for name=yahoo.com type=A: Host found but no data record of requested type

 

What are the outputs of

Code:

dig yahoo.com
ping -c4 yahoo.com
ping -c4 216.109.112.135
ifconfig

?