Konstantin Ryabitsev has announced
that the movement of kernel mailing lists away from the venerable
vger.kernel.org system is nearly complete:

Over the past few months we’ve migrated all of the vger.kernel.org
mailing lists, with the exception of the Big One (linux-kernel, aka
LKML). This list alone is responsible for about 80% of all vger
mailing list traffic, so we left it for the last.

This Thursday, December 14, at 11AM Pacific (19:00 UTC), we will
switch the MX record for vger to point to the new location
(subspace.kernel.org), which will complete the mailing list
migration from the legacy vger server to the new infrastructure.

Source: LWN.net – The end of vger.kernel.org