I think this is the correct topic for this. I just noticed there is an unsubscribe by email option on the footer.
That second one defaults to a link like this for my site:
reply@community.namati.org
I don’t have that email address configured on my mail system. In fact I don’t have email on community.namati.org at all. Is there an admin setting (which I looked for and did not find) for setting up a working email address?