Hi all,

Chasing someone that can help with an ongoing issue. One of our mail servers 
are unable to send to any Microsoft Hotmail or live users.
Have been through the SNDS process and says that all IP's are ok and that 
errors are unlikely.

It appears to be relating to a specific /24 range. However, I can't find any 
issues that would be causing the mail to be rejected.
Below is the error being received back from Microsoft mail servers.



    said: 550 5.7.1 Unfortunately, messages from [xxx.xxx.xxx.xxx] weren't sent.

    Please contact your Internet service provider since part of their network

    is on our block list (AS3150). You can also refer your provider to


    [HK2APC01FT025.eop-APC01.prod.protection.outlook.com] (in reply to MAIL

    FROM command)

Best Regards,

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