exchange2000的问题!!!

最近我用联通的IP到中国企业网申请了一个WWW.EARL*.COM,然后又用另外一个IP申请了MAIL.EARL*.COM

现在我一台PC直接挂到INTERNET上,该PC没有和内网相连接,是MAIL.EARL*.COM这个IP.我把这台PC做成了AD,DNS设为MAIL.EARL*.COM.装上EXCHANGE2000做EMAIL服务器.安装好后建立了两个EMAIL帐号,123,567

现在我用123@MAIL.EARL*.COM向567@MAIL.EARL*.COM相互发送邮件,在哪里都可以发送和接受(只要能上网的地方都可以)

但是我用123(567)我的21CN上的MAIL发送邮件时,系统显示已发出,但是,21CN上的却收不到.而123(567)却收到系统的以下警告:

This is an automatically generated Delivery Status Notification.

Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server.

lzh523@21cn.com

但是,我的21CN发送的邮件,123(567)确都能接受的到

请高手大大们帮我解决一下,谢谢了

刚才用WWW.DNSREPORT.COM检查了一下我的电脑,出现一下提示
Getting MX record for mail.earlresort-hotel.com... There is no MX record for mail.earlresort-hotel.com! That's bad.
Checking for an A record... Got it!

Host Preference IP(s) [Country] mail.earlresort-hotel.com 0 61.242.108.21 [CN] --------------------------------------------------------------------------------


Step 1: Try connecting to the following mailserver:
mail.earlresort-hotel.com - 61.242.108.21

Step 2: If still unsuccessful, queue the E-mail for later delivery.


Note: if you enter an entire E-mail address (such as postmaster@mail.earlresort-hotel.com), we will try to connect
to each mailserver to ensure that they are live and accept mail to the mail.earlresort-hotel.com domain