There is a new mailing list called Hurd-devel-readers. It is the read-only version of Hurd-devel.

Hurd-devel is a mailing list for detailed discussions of design and implementation issues in the GNU Hurd; it is an internal low-volume list restricted to the core developers of the Hurd. While the web-based archive of Hurd-devel has always been public, the new mailing list Hurd-devel-readers provides a convenient way to follow the discussion of the Hurd experts.

If you are a recipient of Hurd-devel-readers and want to follow up on the discussion, please reply to the Bug-hurd mailing list.