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Ok this is somenthing unbelievable, we have a website, users sign up and receives links to confirm they signed up BUT:

 1 - microsoft blocked our IP (no one with microsoft email account can receive our emails)
 2 - we tryed contacting microsoft submitting the detailed form about our problem
 3 - we posted 3 times in their community about our problem
 4 - we tweeted they about our problem
 5 - we tryed finding out some telephone support number (the few there are arent' helping at all)

Do you think we solved? the answer is NO :/

We still unable to send emails from our IP to microsoft email accounts, since 3 months back.

Our emails are perfect we checked all the email headers following microsoft guidelines but it seems not enought, checking our IP reputation it seems everythings ok, indeed we can send email easly to any other provider , gmail, yahoo, etc

Do you know any other way to try to get help ?

FULL STACK ERROR FROM MICROSOFT:

 host mx1.hotmail.com[65.55.37.120] said: 550
    SC-001 (COL0-MC4-F28) Unfortunately, messages from 94.23.***** 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. (in reply to MAIL
    FROM command)

We are running a Virtual Private Server , so no HOSTING SITE, using NGINX too

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closed as off-topic by Greg Askew, joeqwerty, Ward, Falcon Momot, Dennis Kaarsemaker Nov 10 '13 at 13:37

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions must be relevant to professional system administration. Server Fault is dedicated to professional system and network administrators. End user and enthusiast questions are off-topic (contact your system administrator or hire a professional to help you out). Please see the Help Center for more information." – Greg Askew, joeqwerty, Ward, Falcon Momot, Dennis Kaarsemaker
If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer

Microsoft ban whole /24 IP ranges they do not usually block a single IP, as a service provider I can tell you that it is near impossible to get MS to budge on such problems even more so when other people in the same IP range as you could be sending spam or poorly constructed emails from badly configured servers.

The best solution to this is to pipe your emails through another IP/service such as authsmtp or alter things on your site so that any emails going to a hotmail email address come from a hotmail email address.

Also keep in mind that if your website is just a standard hosting package you are sharing the IP with 100's if not 1000's of others who could be hurting your chances, to be blunt, Microsoft don't care about your site and no amount of complaining will make them care, if email delivery is vital for you find an assured method of delivery instead.

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