[Bug 1696202] [NEW] Setting private_roster to list admin only causes subscriptions to break

[Terri]

Public bug reported:

This is an odd one, seen on https://mail.python.org/

The Pycon Pune list was set up such that private_roster was set to list
admin only, whereupon all subscribers got a message "The hidden token
didn't match. Did your IP change?" after they entered their email
address and were sent to the standard page at
https://mail.python.org/mailman/confirm/pycon-pune

I reset the private_roster to "List members" and for some reason, this
solved the problem and would-be subscribers get the usual "Your
subscription request has been received, and will soon be acted upon."
message.

Not sure if this is a mail.python.org specific bug or a mailman 2.1
issue in general, but I figure Mark's equipped to handle either one so
filing here is the right choice regardless.

** Affects: mailman
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1696202

Title:
  Setting private_roster to list admin only causes subscriptions to
  break

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