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If I send emails to an acquaintance who has his email account under or under hotmail, then I get for two weeks always a message from the server that the email could not be sent because supposedly my web server was blocked.
Hotmail and Blacklist
The email contains the following text
Block list

MailEnable: Message could not be delivered to some recipients.
The following recipient(s) could not be reached:

Recipient: []
Reason: 550 SC-001 (BAY004-MC3F22) Unfortunately, messages from 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

The email contains the following text

Where can I remove my own web server from the blocked list?
You can remove your own server from the blocklist Blacklist under
[Lnk "" /]

Under the item What domain are you sending to comes as a selection:,, or
According to my knowledge, the blocking list applies to all 4 Zieldomains of Microsoft

After the registration of the data and the sending one receives from Microsoft a confirmation


Successfully Submitted!
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Service Request #: 1398680401
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Delist IP from Hotmail BlockList
Hotmail Blacklist Removal
How to Remove Your IP from the Hotmail Blacklist
The Troubleshooting page of Hotmail is shown as information for errors

550 SC-001

Die E-Mail wurde von wegen Verletzung der Richtlinien zurückgewiesen. Ursache für die Zurückweisung können Spam-verdächtige Inhalte oder die Zuverlässigkeit der IP-Adresse/Domäne sein. Wenn Sie kein E-Mail-/Netzwerkadministrator sind, wenden Sie sich an Ihren E-Mail-/Netzwerk-Dienstanbieter, um Unterstützung zu erhalten.

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