(No) Email to/from accounts provided by Microsoft

For some time now I have not been able to answer any email from accounts provided by Microsoft. This includes accounts in the hotmail.com, outlook.com, and microsoft.com domains. Why? Microsoft rejects all my emails because – they claim – another server on same network as mine was suspected to send spam-like messages.

This is what I get if I try to send an email to a microsoft provided email account:

host mx2.hotmail.com[65.55.37.88] said: 550 SC-001 (COL004-MC2F33) Unfortunately, messages from 81.169.152.71 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. 

The error code above is defined on the page they mention as:

Mail rejected by Outlook.com for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation. If you are not an email/network admin please contact your Email/Internet Service Provider for help.

Essentially, my server is found guilty by association.

I have to intention to waste my time trying to resolve this issue with Microsoft. If you want an answer to your email do not use an account that relies on Microsoft’s infrastructure.

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