Good catch, Grant. They are GET requests. Our developers implemented the 
List-Unsubscribe HTTP method a long time ago and it appears that it was never 
updated to comply with RFC 8058. I'm still curious as to why I'm only seeing 
this with .edu domains hosted on Office365 and not Office365 in general 
(perhaps different filtering techniques are used for Universities?), but the 
fix is clearly to have our developers fix the header.

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