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Mail Server IP Blocked by Hotmail

Posted on 2014-02-17
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Last Modified: 2014-03-18
Hi,

The IP address of a VPS I use for web and email hosting was blocked by hotmail on the 10th of February 2014. The smtp error code quoted in the Mail Delivery Failed email, from hotmail, was 550 SC-001 (COL0-MC3-F51). The VPS manager requested that the IP be unblocked by hotmail, however it is still blocked.

What can be done to get this resolved quickly?

Thanks in advance
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Question by:mavcom
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Expert Comment

by:hecgomrec
ID: 39867251
First thing first.... Hotmail can not remove you from anywhere as they don't put you in the list but somebody else.

Please go to :www.mxtoolbox.com/blacklists.aspx#sthash.XYopkJer.dpuf, enter your IP and check who puts you in the list.  Before you do that, please note the last link in that window "View the 100+ blacklists we check." you may go back there to have more information on those so you can get information on how to get removed.

Once the check is finish, see who listed you and the reason.  Then work on the solution for the provided reason on your LAN and when you think you solved the issue then request the removal.  If the issue is not solved and prevention for it to happen again will put you back in the list faster than before and it will be harder to get removed next time.

Hope this help.
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Accepted Solution

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mavcom earned 0 total points
ID: 39888602
Hi

Hotmail responded and removed us. Said that there was some suspicious activity but will look at the list above before closing the question.
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Author Comment

by:mavcom
ID: 39888624
Hi hecgomrec,

Thanks for your answer, however that tool was used prior to posting the question and the results were "ok" for all but 1, which timed-out. The issue was with hotmail.
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LVL 11

Expert Comment

by:hecgomrec
ID: 39888775
If your IP was not listed, then it was your ISP relay server.

Usually, they won't tell you if your ISP is the one blacklisted... not good for business :-).

Hope everything is good now, if not just let us know.
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Author Closing Comment

by:mavcom
ID: 39936343
Posted suggestions were tried before and issue was resolved
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