[Bug 1774826] Re: Feature request: simple captcha

[Ralf Jung]

I have implemented such a simple CAPTCHA for Mailman 2 and described the
patch at <https://www.ralfj.de/blog/2018/06/10/mailman-subscription-
spam-continued.html>.  If there is interest from the maintainers, I'd be
happy to prepare a merge request for this.

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https://bugs.launchpad.net/bugs/1774826

Title:
  Feature request: simple captcha

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