The ATSTP email support list experienced a problem last week. It is run on a Google List. Either someone marked it as sending SPAM or Google got aggressive on marking Groups as SPAM. For 2 days the list was marked as sending SPAM and new users were not allowed to join the list. I asked Google to review this designation, which they did, and as a result of this review was the lifting of the SPAM designation. There was no evidence of SPAM in this list. Problem solved (for now).
If you’re on the list and want to get off or want the emails to stop, you can manage your list membership at Google.