Outlook / SMTP error code 550

smtp;550 5.7.1 Unfortunately, messages from [x.xx.xx.xx] 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. [#.eop-nam02.prod.protection.outlook.com]

High severity

Sometimes this bounce isn't related to an IP block. Check your Return-Path (envelope from) domain as well for any current block listings.

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Built with

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