@ajfriesen , @Stromfeldt I got these too, the day before yesterday. Same Bell and T-Mobile gateway email addresses. They seemed to be coming from a python aiohttp user agent — a UA I’ve gotten spam signups from before — and IP addresses in the US and Bangladesh.
Email delivered to them, but they created memberships without signing up for the newsletter (or unsubscribed immediately after signing up).
I deleted them and added a firewall rule.