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The IP address: 210.21.xxx.xxx was blocked by MSN Hotmail because the vast majority of all the email that you send to us has been judged to be spam by MSN Hotmail’s internal filtering system.Currently, this IP is also blocked by third party blacklists Sorbs and CBL. Please check here: http://www.senderbase.org/search?searchString=210.21.xxx.xxx

While I cannot guarantee email deliverability from your IP I can offer you some advice that may help your situation.

1.              Make sure that you have SPF/SIDF records in place.  You can go to http://www.microsoft.com/senderid for more information on this.

2.              Segment your mailing infrastructure by IP.  Marketing e-mail, transactional corporate, “forward to a friend” e-mail and signup e-mails should be sent from different IP’s.  This will help to identify what types of messages are being flagged by Hotmail customers.  

3.              Strengthen the sign up process.  Confirm that you are using a double-opt-in sign up process.  This will not help in removing existing Hotmail customers from your e-mail lists but it will confirm the authenticity of those who sign-up on for your e-mail campaigns and newsletters.

4.              If you have any feedback loops setup with other ISPs you should look for trends to try and determine possible causes - a new data source?  New advertisement?  Maybe folks signing up don't recognize the mail?

5.              Clearly mark your e-mails so that Hotmail customers are able to quickly and easily identify that they requested e-mails from your service.

6.              Do some analysis on the data regarding complaints - look at Hotmail customers who have never clicked, opened, responded or bounced in any way.  These poor performers could contain many bad addresses.

7.              Clean up your lists.  Remove those who do not want to receive the emails.  Make the unsubscribe process more visible.


8.              Enroll in the Sender Score program.  This is the only Whitelist which Hotmail uses.  It is owned and operated by Return Path.  You can find information about this program at http://www.senderscorecertified.com.

9.              Please visit http://www.senderbase.org to verify that your IP is not being targeted by any 3rd party block lists.   

In addition to these recommendations, Hotmail has created the Smart Network Data Services program.  This is a service that helps legitimate email senders work with their customers and partners to reduce spam originating from their IP.  http://postmaster.msn.com/snds/.  This program allows a sender to monitor the ‘health’ of their IPs.  

¡¤         Hotmail has created the Smart Network Data Services program.  This is a service that helps legitimate email senders work with their customers and partners to reduce spam originating from their IP.  http://postmaster.msn.com/snds/.  This program allows a sender to monitor the ‘health’ of their IPs.  

¡¤         I would also strongly recommend that you authenticate your outbound email via Sender ID and publish your SPF records for your outbound email IPs and register with Sender ID.  You can find additional information at http://www.microsoft.com/senderID or you may email senderid@microsoft.com for support.  Please note that technical standards (RFC 4408) discourage use of "ptr" for performance and reliability reasons.

¡¤         Monitor user complaints.  Hotmail also has a sender complaint feedback loop program Junk Email Reporting Program (JMRP).  Enrollment in this, free of charge, program will benefit you as a sender as it will keep your e-mail lists updated and populated with interested MSN Hotmail Customers.  Participation in this program will remove those MSN Hotmail Customers who do not want to receive e-mails from your company.  If you are interested in joining this program please email HMJMRX@microsoft.com.  


While using the SNDS tool, enrollment in the JMRP or having your IPs registered with Sender ID will not allow emails from your mail servers to bypass our filters, these are in place to help legitimate companies deliver their emails to Hotmail Customers.

¡¤         SenderScore Certified Mail Program.  Many legitimate mailers and marketers have qualified and joined this “white listing” program to improve mail deliverability and decrease email from being filtered to the Junk E-mail Folder.  Sender Score is a third party program, administered by Return Path.  Sender Score (www.senderscorecertified.com) is the only White Listing service to which we subscribe.

The troubleshooting steps in this email are recommendations only.  Microsoft makes no guarantees that following these steps will guarantee deliverability to MSN, Hotmail, or Live.com customers.

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