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Plusnet suddenly blacklisted by Outlook

Posts: 3
Thanks: 1
Registered: ‎21-08-2020

Plusnet suddenly blacklisted by Outlook


I emailed a long time client today - a reply to their email to me, and to my dismay I received the following reply from their outlook email basically saying mine was rejected for spam - actual message below :-


550 5.7.1 Unfortunately, messages from [IP address deleted by me for security] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider to []

From doing some research about this, I can see that previously Plusnet has had to contact Microsoft to get this changed so please can this be actioned a.s.a.p. Huh