I think the fault is with the mailing list administrator.
When you have a list that goes out to all 40K students, you don't just accept emails willy-nilly. Imagine the abuse. Things with that much volume are usually moderated.
That said, there are a few situations where that level of control is impractical (i.e. open source projects). Every once in a while, I'd see random LinkedIn invites from those lists due to that pesky system. When I had that incident myself, I'm really thankful that the larger lists had filtering or else it would have easily reached 100k+ people who are most likely in my same professional circle.
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