Erh, I was just looking at my Akismet filter. I have a bunch of spams from "d%%s_test%%%@hotmail.com", what's unusual is that several of the spams are logged with an IP address of 192.168.x.x, e.g.
life insurance | [email redacted] | lifeinsurance.iMegastores.com#0 | IP: 192.168.4.80
life insurance | [email redacted] | lifeinsurance.iMegastores.com#0 | IP: 192.168.2.4
(spam text not included).
while others are real looking IPs
whole life insurance | [email redacted] | fun.to/wholelifeinsurance#0 | IP: 66.246.82.114
This seems to suggest something on the internal wordpress.com network has been botnetted, or that someone at WordPress is testing something?