I'm no longer in this position, but for 20+ years I was the lead for a University email system.
If I made a technical decision, based on evidence, to block an entire AS, it was my decision as I was responsible for the security of the entire organisation with respect to incoming email. That was for upwards of 25000 people. I did this many times, and in 20 years received precisely *one* complaint. Just the one. If you base your decision on evidence and can back it up if challenged, then do so. Graeme
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