Most of my spam messages are attributed to gmail per Spamcop. However, for the past year, I get 1 or 2 a day that Spamcop says are from Microsoft. Most of the

Most of my spam messages are attributed to gmail per Spamcop. However, for the past year, I get 1 or 2 a day that Spamcop says are from Microsoft. Most of the ones from Microsoft servers are old Mailchimp messages (headers and body, hours to 10 years old) with 2 image links and 2 shortened links added. Yahoo/AOL/Verizon does not detect them as spam. I report to all involved and receive auto-responses and canned text. AWS is helpful, but Microsoft, Cloudflare and Zendesk are less than helpful. The spam messages are useless without the images, so I concentrate on the image links. There seems to be an endless supply of free image hosting services.