cannot unsubscribe

It seems I cannot unsubscribe from this mailing list.

I sent a mail both to vim-unsubscribe@vim.org and to the google address
one. I received the confirmation but replying lead to nothing (vim.org address)
and to a

> Delivery to the following recipient failed permanently:

vim_use+unsubscribe@googlegroups.com

> Technical details of permanent failure:
> RpcError

error. I don't have spam filtered, so I wonder what's happening. Thanks in
advance

-Franco

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