[ESS] Mail Server timeout of 1--2 hours

[Martin Maechler]

Because of the replacement of the current NAS (Networked Disk Server),
there will be a mail server timeout
from 18:00 till about 20:00 Swiss time, i.e. UTC+2

This will also effect cran.CH.r-project.org,
our ftp server and http://ESS.r-project.org/
but *not* the subversion server  svn.r-project.org
(because that is completely independent with no mounted file
systems).

Martin Maechler, ETH Zurich