Mail Server: Host or domain name not found.

[shoutkeeper]

Hello PEOPLE,

I am setting up a mail server at our school using postfix, dovecot, with MailScanner and Spamassassin. The only problem is I CANNOT SEND outbound mail but I can receive INBOUND mails from other web based mail such as yahoo. Please Help me with this problem... the text that follows are the response of the Mailer-Daemon everytime I send oubound mail.

Any Help would be appreciated. Thanks...

---#####*****#####---

This is the mail system at host ns1.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

<user@yahoo.com>: Host or domain name not found. Name service error for
name=yahoo.com type=A: Host not found

[falko]

What's in your /etc/resolv.conf?

[shoutkeeper]

/etc/resolv.conf file contains:

search domain.edu.ph
nameserver 10.0.0.2
nameserver 10.0.0.2
nameserver 127.0.0.1

10.0.0.2 is the IP of my router

[falko]

Please try this:
search domain.edu.ph
nameserver 145.253.2.75
nameserver 213.191.92.86
nameserver 10.0.0.2
nameserver 10.0.0.2
nameserver 127.0.0.1Does it work then?

[shoutkeeper]

Please try this:
search domain.edu.ph
nameserver 145.253.2.75
nameserver 213.191.92.86
nameserver 10.0.0.2
nameserver 10.0.0.2
nameserver 127.0.0.1Does it work then?

what is

nameserver 145.253.2.75
nameserver 213.191.92.86

?

[zcworld]

what is

nameserver 145.253.2.75
nameserver 213.191.92.86

?

its tell the system what DNS server to look at
nameserver : than the DNS server IP

[falko]

what is

nameserver 145.253.2.75
nameserver 213.191.92.86

?
These are (known to work) nameservers of two German ISPs.

[shoutkeeper]

Still I cannot send outgoing emails... my email software is AtMail

[falko]

What's in the mail log?