[Bug 1859104] [NEW] It is possible to mailbomb a third party by repeatedly posting the subscribe form.

[Mark Sapiro]

Public bug reported:

This can be prevented by refusing to pend a subscription when one is
already pending, but that means if a subscriber loses or doesn't receive
the confirmation request email, she has to wait PENDING_REQUEST_LIFE
(default 3 days) before she can request another.

It can also be avoided by setting the list's subscribe_policy to
Moderate, but that may not be desirable in many cases.

Because of these considerations, I will implement the refusal to pend a
subscription when one is already pending, but make that depend on a new
REFUSE_SECOND_PENDING mm_cfg.py setting.

** Affects: mailman
     Importance: Medium
         Status: In Progress

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https://bugs.launchpad.net/bugs/1859104

Title:
  It is possible to mailbomb a third party by repeatedly posting the
  subscribe form.

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