most of the phishing emails bypassing my spam filters (on Fastmail) recently have been from prod.outlook.com

it's almost impossible to figure out where to report spam; most of their support articles are about how you report spam in Outlook instead. For reference, those reporting emails are:

phish@office365.microsoft.com

junk@office365.microsoft.com

but you get zero feedback, and I keep getting repeat phishing too

they care so little about cleaning up their own act, i'm considering just rejecting their stuff with a bounce message. i checked, and there's very little important traffic from prod.outlook.com arriving in my inbox.