OK. I got this in my email:
Hello,
You have been automatically removed from [email protected] because your Email Service Provider reported to us that message Once... A long time ago from [email protected] has been marked as spam.
We suggest that you check your spam folder as soon as possible to see if your Email Service Provider has diverted other legitimate messages into it.
You will receive no more emails from that group. If this was a mistake, you can resume your subscription within the next 7 days by clicking the following link:
Resume Subscription
Groups.io groups offer several options for controlling how much and what types of emails to receive. See this Help Center article for more information.
If this happens repeatedly please check with your Email Service Provider to learn about how they decide to send feedback reports to list services (such as Groups.io groups).
The Groups.io Team
Anyone else have this problem? I know this message wasn't spam.