Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium


Exchange 2007 DNSconnectordelivery queu

Posted on 2009-12-16
Medium Priority
Last Modified: 2012-05-08
it is sbs 2008

10 outbound external domain mails are in DNSconnectordelivery queu

Checked my IP blacklist status

checked sembee article regarding this problem but lo luck.

http://www.dnscolos.com/dnsreport.php try this got report please see attachment

any ideas?

Question by:NarendraG

Expert Comment

ID: 26069220
Try the telnet test from the Exchange server that is sending outbound to see what response you get from the remote mail server.
LVL 14

Accepted Solution

Burns2007 earned 1000 total points
ID: 26069223
Your mail domain is ibopemedia.com?

If so then your MX record is on a blacklist: http://cbl.abuseat.org/lookup.cgi?ip=

IP Address is currently listed in the CBL.
It was detected at 2009-12-17 02:00 GMT (+/- 30 minutes), approximately 3 hours ago.

Follow that link above for a link to request removal.
By the way, I found it by doing a blacklist check from mxtoolbox.com against ibopemedia.com
LVL 13

Author Comment

ID: 26069264
Requested removal from blacklist
then wt could be the problem with dns error?
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

LVL 14

Expert Comment

ID: 26069328
No idea why it is reporting that. The parent servers return fine from elsewhere:

Actually, just tested my own domain on dnscolos and it failed parent servers too. so i think it's something at their end.
LVL 13

Author Comment

ID: 26069342
i have this problem from last 5 days

even dail i am checking mxtoolbox.com for blacklist no problem

today only i found it as blacklisted
LVL 65

Assisted Solution

Mestha earned 1000 total points
ID: 26075766
The DNS error that you have posted you need to take up with whoever runs your DNS servers. It will not be related to Exchange or email failure.

LVL 13

Author Comment

ID: 26077172
got the solution problem fixed sembee

Sending email to certian domains does not work when you run Exchange Server 2007 on a Windows Server 2008-based computer

You may have trouble sending mail to certain domains while using Exchange Server 2007 on Windows Server 2008. The Queue Viewer displays the following status error for the domain in question:

451 4.4.0 primary target IP address responded with 421.4.4.2 unable to connect.attempted failover to alternate host, but that did not succeed.Either there are no alternate hosts, or delivery failed to all alternate hosts.

This problem occurs because routers do not support the TCP autotuning settings in Windows Server 2008.

To disable autotuning, follow these steps:

Run CMD as Administrator

At the command prompt, type the following command, and then press ENTER:

netsh interface tcp set global autotuninglevel=disabled

This command disables the Receive Window Auto-Tuning feature.

Exit the Command Prompt window.

Restart the computer.

Expert Comment

ID: 27419431

Featured Post

Problems using Powershell and Active Directory?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Eseutil Hard Recovery is part of exchange tool and ensures Exchange mailbox data recovery when mailbox gets corrupt due to some problem on Exchange server.
Exchange database can often fail to mount thereby halting the work of all users connected to it. Finding out why database isn’t mounting is crucial and getting the server back online. Stellar Phoenix Mailbox Exchange Recovery is a champion product t…
This video shows how to quickly and easily deploy an email signature for all users in Office 365 and prevent it from being added to replies and forwards. (the resulting signature is applied on the server level in Exchange Online) The email signat…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Suggested Courses

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question