Dear Friends,
I am facing a very strange problem with our Mailing System Exchange5.5sp4.
The issue is that we are not able to send email message to some of the sites
on the internet. Most of the other popular sites , you can say 90% of the
sites are reachable by our email clients. But when the clients try to send
message to those few site, they get and Non-Delivery-Report saying that the
mail could not be delivered. Strange enough that email address is
reachable through yahoo, hotmail and other sites.
I have checked our router for any access-list blocking but I am sure nothing
is of that sort, no access-lists are controlling those addresses. Our ISP
from whom we are connected to the internet is also able to reach that sites.
But we using the ISP's DNS servers for name resolution cannot connect to
those particular hosts.
One strange behavior though, when I tried to trace route a website add, for
that particular mail host, I is taking more than 15 hops and then declared
unreachable by our Static Router, No Dynamic protocol is running between us
and our ISP, we are using default route.
Any help or insights would be valuable and really be appreciated.
I know this has nothing to do with Cisco, but the fact is Applications, and
User Usability is driving the Technology. so this mail is not so uncommon
for a Cisco SE.
Thanks and Regards,
S. Raees
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