Dear all, I have setup exchange 2003 server on a domain controller. My internal and external internet domain name is, (e.g.) abc.com. With support from our ISP they have created a Mail exchange record(e.g, mail.abc.com) and A record (e.g., mail.abc.com) for us. The mail exchanger is pointing to our internal router. I have configured my router with both internal ip address and external ip address. Now my doubt is, I am not able to ping my mail exchange record and A record in the internet. And also I am not able to send mail to my domain. In yahoo I am getting the following error! Hi. This is the qmail-send program at yahoo.com. I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. <anand@xxxxxxx>: Sorry, I couldn't find a mail exchanger or IP address. (#5.4.4) Please help me! Thanks in advance Regards, Anand