Hello, Our mail server uses "sendmail" and DNS server used "bind". We have a problem with sending mail to a site X which returns error "Sender IP must resolve". So, that means their mail server could not reverse map our mail server's IP address to fully qualified domain name. On our DNS server, I can correctly reverse map our mail server's IP address: dig -x <our mail server ip address> The answer section returned is correct. However, on an external network, dig -x <our mail server ip address> does NOT return an an answer section. Instead, it only returns an AUTHORITY section stating our service provider's IP address? Does this mean our service provider doesn't have a "glue record". Or is it possible "dig" is not sufficient to test reverse lookup and the problem is at our end ? Grateful for any help. Thanks, Tony - : send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
