[X-Istence]

Single user... me. My email address is used on all my git commits/mailing lists across the web.

I check my junk folder every other day to make sure that legitimate mail does not go through because I've set my rspamd config pretty tight.

So all of these are classified correctly as spam by human eyes.

[PreInternet01]

Interesting, thanks! For what it's worth: my multiple-thousands-of-users mail server hasn't seen any of these Azure tenants in the past 14 days.

[johnklos]

That doesn't seem too surprising. While my account just gets three or so "digital marketing" or "mobile app" spam a day from Outlook, Mom was getting dozens of Apple / Home Depot / Harbor Freight / Lowes phishing spam a day from Outlook. Reporting them did absolutely nothing, and there were no identifying patterns beyond the painfully obvious fact that they were all from the same campaign, so I'd wager that creating unique accounts on Outlook is trivial.

[X-Istence]

That's interesting to say the least... it means that there are MANY MANY more azure tenants that are used to send spam :/