maintainer of strucchange unreachable?

It's two days I try to answer to a mail of Achim Zeileis, the maintainer of
strucchange package, using the mail address: zeileis at ci.tuwien.ac.at.

Well, I'm still here :-) And the e-mail address is supposed to be right
as well.
I've got no clue why you're not able to mail to that address.

For the moment you could use one of the following addresses:
zeileis at statistik.uni-dortmund.de
zeileis at gmx.net

Thanks for your effort
Achim

I got the following error:

   ----- The following addresses had permanent fatal errors -----
<zeileis at ci.tuwien.ac.at>
    (reason: 550 5.7.1 <zeileis at ci.tuwien.ac.at>... Access denied)

Can anyone tell me how to reach him?
Thanks,

Philippie Grosjean

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