This is indeed the issue : everything is set up correctly. SNDS has a "View IP Status" page that is supposed to tell you when there is a block, there are also SMTP replies for that. Instead, Outlook just replies "accepted for delivery" when it is in fact blocked.
What is even more curious about this is that some of the IPs blocked are green on SNDS, and they accepted to lift the block. So, was the block legitimate in the first place ? I tend to doubt it. Mathieu.
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