Everything should be back up now...

[Alan DeKok]

  As a side note: you may temporarily get bounces from the mailing
list, with messages like "please use mx.xs4all.nl rather than this server".

  It's a side effect of the DNS problems.  If you re-start your DNS
server, or wait a little bit for the old records to time out,
everything should come back fine.

  Again, sorry.  I'll be taking the issue up with the people responsible.

  Alan DeKok.
--
  http://deployingradius.com       - The web site of the book
  http://deployingradius.com/blog/ - The blog