The summary is : First of all, check MX record of these domains from your local dns( which is being used by your internal mail servers to deliver the mail to remote smtp) and compare the out put with third party tools like dnsstuff.com,kloth.net. They *must* be same otherwise your DNS may be culprit if you are managing authorized DNS RR for these domain.
As I ran MX query on http://www.kloth.net/services/dig.php and got following output lantoy.com.cn. 7200 IN MX 10 61.156.10.196. szonline.net. 3600 IN MX 10 121.14.243.132. centrum.co.in. 86400 IN MX 10 smtp1.centrum.co.in. centrum.co.in. 86400 IN MX 10 smtp2.centrum.co.in. centrum.co.in. 86400 IN MX 20 70.47.89.53. Can you notice '.' (dot) at the end of IP address . As per my knowledge, '.' always appended after FQDN only , not IP. The modified version should be like that.... lantoy.com.cn. 7200 IN MX 10 61.156.10.196 Are you hosting these domains in your DNS or at colo sites ? --- In [email protected], "rahul_jems" <[EMAIL PROTECTED]> wrote: > > Hi, > > I am having a very unusual problem. According to RFC standards the MX > should point to an host name rather then an IP. And now my issue is > that I have a few clients they say that when they send a mail from > gmail/yahoo account the mail is getting delivered to the same account > but now when I try delivering the mail from my servers (Tried with 15 > servers) all mails get bounced sent to particular email ID's after > checking I found that the MX is pointing to an IP address due to which > it gets rejected.. > > Example domain :- lantoy.com.cn, szonline.net, centrum.co.in > > The temp solution to this problem that I made entries for these > domains in my DNS to resolve the MX records. but there are many other > domains too. > > Is there any way that I can sort out this issue? > > Thanks > Rahul >
