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They have replied

Hello uptonlawrence@gmail.com,
 We're writing to let you know that the group you tried to contact (Privacy) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren't able to post:
  * You might have spelled or formatted the group name incorrectly.
  * The owner of the group may have removed this group.
  * You may need to join the group before receiving permission to post.
  * This group may not be open to posting.
 If you have questions related to this or any other Google Group, visit the Help Center at http://support.google.com/a/wix.com/bin/topic.py?hl=en_US&topic=25838.
 Thanks,
wix.com admins

and so fast it could have been done by human hand

so you cannot unsub

it is a lie