Unable to send mails to @hotmail.com: Please contact your Internet service provider since part of their network is on our block list

Created:

2016-12-12 03:41:20 UTC

Modified:

2017-08-08 13:10:07 UTC

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Unable to send mails to @hotmail.com: Please contact your Internet service provider since part of their network is on our block list

Applicable to:

  • Plesk 12.5 for Linux

Symptoms

Unable to send mails to hotmail.com:

status=bounced (host mx4.hotmail.com[10.10.10.10] said: 550 SC-001 (COL004-MC6F3) Unfortunately, messages from 20.20.20.20 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))

Cause

IP address 20.20.20.20 is blocked on Microsoft side

Resolution

Contact Microsoft to un-block IP address

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