Can't send mail

[Geoinline]

I can recieve mail from gmail.com and hotmail.com but can't send mail back to them. I can send mail locally. I got this error.

This is a MIME-encapsulated message.

--5D72216EC058.1133892735/server1.example.com
Content-Description: Notification
Content-Type: text/plain

This is the Postfix program at host server1.example.com.

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 Postfix program

<benkapp@gmail.com>: Host or domain name not found. Name service error for
    name=gmail.com type=MX: Host not found, try again

--5D72216EC058.1133892735/server1.example.com
Content-Description: Delivery report
Content-Type: message/delivery-status

Reporting-MTA: dns; server1.example.com
X-Postfix-Queue-ID: 5D72216EC058
X-Postfix-Sender: rfc822; web2_admin@domain.com
Arrival-Date: Thu,  1 Dec 2005 12:26:02 -0500 (EST)

Final-Recipient: rfc822; user@gmail.com
Action: failed
Status: 4.0.0
Diagnostic-Code: X-Postfix; Host or domain name not found. Name service error
    for name=gmail.com type=MX: Host not found, try again

--5D72216EC058.1133892735/server1.example.com
Content-Description: Undelivered Message
Content-Type: message/rfc822
Content-Transfer-Encoding: 8bit

Received: from UebiMiau (localhost.localdomain [127.0.0.1])
	by server1.example.com (Postfix) with SMTP id 5D72216EC058
	for <user@gmail.com>; Thu,  1 Dec 2005 12:26:02 -0500 (EST)
Received: from client 71.244.96.15 for UebiMiau2.7 (webmail client); Thu, 1 Dec 2005 12:26:02 +0100
Date: Thu, 1 Dec 2005 12:26:02 +0100
From: "Web2_admin" <web2_admin@domain.com>
To: user@gmail.com
Reply-to: "Web2_admin" <web2_admin@domain.com>
Subject: teste
X-Priority: 3
X-Mailer: UebiMiau 2.7.2
X-Original-IP: 71.244.96.15
Content-Transfer-Encoding: 8bit
X-MSMail-Priority: Medium
Importance: Medium
Content-Type: text/html; charset="iso-8859-1";
MIME-Version: 1.0
Message-Id: <20051201172602.5D72216EC058@server1.example.com>

test


--5D72216EC058.1133892735/server1.example.com--

I says it can't find the MX record for gmail.com.

Any suggestions would be appreciated.

[till]

Please check the file /etc/resolv.conf
There must be at least one nameserver inside.

Please have a look at this post too:

http://www.howtoforge.com/forums/showthread.php?t=1441

[Geoinline]

Thank you. That was just what I needed