Mail delivery failed: returning message to sender

Singnet Mail Delivery System noreply@singnet.com.sg
Mon Nov 29 06:42:04 GMT 2021


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A message that you sent could not be delivered to one or more of its
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  grandslam@live.co.za
    host eur.olc.protection.outlook.com [104.47.5.33]
    SMTP error from remote mail server after pipelined end of data:
    550 5.7.1 Unfortunately, messages from [13.251.146.0] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [HE1EUR02FT039.eop-EUR02.prod.protection.outlook.com]
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From: "BEN JOHNSON" <mauve-patches@sourceware.org>
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Date: Mon, 29 Nov 2021 14:37:53 +0800
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