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Namespace mining

Posted on 2013-11-20
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Last Modified: 2014-02-06
Our users cannot email any hotmail.com, live.com, msn.com, or outlook.com domains.

Here's the bounceback we're receiving:

BAY0-MC1-F50.Bay0.hotmail.com gave this error:
SC-002 (BAY0-MC1-F50) Unfortunately, messages from x.x.x.x weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.

We have contacted our ISP, who told us it is a problem with our 2010 Exchange server.  

We checked our IP in Outlook's Deliverability Support and it reported the following:

There are indications that the above IP(s) are engaged in namespace mining. Outlook.com is blocking all email sent from this IP.

What do we need to do to solve this problem?
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Question by:fallriverelectric
9 Comments
 
LVL 23

Expert Comment

by:Malli Boppe
ID: 39664923
Check the bewow article and  find out who has blacklisted you.
You need make sure that your antivirus program is up to date on all workstations and servers.
Also make sure that you have proper spam filter for both incoming and out going emails.
Create SPF records for your domain.

http://www.theemailadmin.com/2010/12/how-to-prevent-namespace-mining/
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LVL 8

Expert Comment

by:I Qasmi
ID: 39665298
go to www.whatismyip.com and know ur public ip address

first of all check your servers public ip address : for blacklist

go to mxtoolbox.com > blacklists and enter your server's public ip address

over there and check whether your server's public ip address is blacklisted or not

then if blacklisted then comes the scenario when you need to whitelist it from your side.
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Accepted Solution

by:
fallriverelectric earned 0 total points
ID: 39675016
We've done all of the things above.  None of them have helped.  We're currently working with Microsoft to resolve this.
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Author Closing Comment

by:fallriverelectric
ID: 39710877
Had to follow a series of checks to be sure our systems were secure, then Microsoft unblocked us.
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LVL 2

Expert Comment

by:Greendata
ID: 39763965
who did you contact at Microsoft?
We are having the same problems, we submit a request to delist however it keeps getting rejected. Our work is now heavily effected.
We even joined their recommended programs... (JMRP)  (SNDS)

Any extra information would be extremely helpful.
What checks have they had you perform?
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Author Comment

by:fallriverelectric
ID: 39766059
I'm currently unable to locate where we found the email, but there was a form we filled out that sent a request to the Outlook.com Deliverability Support Team.  We received a response from them letting us know they had investigated our IP and confirmed namespace mining occurred.  They included in the email a list of things we needed to check and then confirm to them we had done.  We did the following things from the list:

checked to ensure relaying was not enabled
ensured the firewall was set to disallow sending on port 25 from anything except the Exchange server
reviewed the outbound mail logs to verify all mail sent as intentional
scanned the mail server with our own anti-virus software as well as with their suggested scanner
ensured the Exchange server was up to date with the latest patches and updates
implemented sending limits

We opened a case with Microsoft paid support to help us accomplish some of these, and since it was a hotmail issue they didn't end up charging us.  After letting the Outlook Deliverability Support team know we'd done all these things, they unblocked us.
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LVL 2

Expert Comment

by:Greendata
ID: 39766338
Thanks:)
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Expert Comment

by:ahmadiah
ID: 39779380
Hello,
I've Got this issue 2 days back. and i filled the form at

https://support.live.com/eform.aspx?productKey=edfsmsbl3&ct=eformts&scrx=1 

I got this reply :

.....
There are indications that the above IP(s) are engaged in namespace mining. Outlook.com is blocking all email sent from this IP.

Namespace mining is a method commonly used by malicious senders to generate lists of email addresses. This approach uses automation to sift through possible email names seeking to identify valid email addresses, e.g., Joe@domain.com, John@domain.com, and Josy@domain.com.

You must correct the problem and you must stop the behavior described above. We recommend that you work with your email or network administrator to review the logs of your email servers. Check the sending log files and concentrate on logs that are sending to nonexistent @hotmail.com, @live.com, @msn.com, @outlook.com?with multiple tries and failures.

What to do next? can you help please?

Thanks
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Expert Comment

by:LessonsLearned
ID: 39839990
I have this same problem and have initiated a trouble call to Microsoft Tech Support.
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