Bug Error S3150 is processed as soft bounce. Should be an Error

There is a bug in this version
A

Alpha1

Guest
Error S3150 frequently occurs with Microsoft email domains. Its not a real bounce, but a notification that the admin needs to take action.

Code:

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 (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [VE1EUR01FT080.eop-EUR01.prod.protection.outlook.com]
It happens when the sender...

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