FSFE's supporter mail redirect is not delivering some mails

Steps to reproduce

  1. Get a FSFE supporter email redirecting to some email
  2. Try to make a libera.chat account with that email
    X. Expect it to not deliver the verification email

Can anyone else confirm this? This seems to be very specific to libera.chat then.

However, I know that at least two persons successfully used their FSFE forwarding address to register an account with libera.chat. And in the server-side spam rejection logs, I couldn’t find a problem with that sender…

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