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From: JPALME@qz.qz.se (Jacob Palme QZ)
Newsgroups: comp.protocols.iso.x400
Subject: Addressibility of UAs?
Message-ID: <728863*@MHS>
Date: 7 May 91 16:15:51 GMT
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The person most responsible for routing in X.400 is
Robert H. Willmott,
U.K. Dep. of Trade and Industri, ITSU,
Kingsgate House, 66-70 Victoria Street,
London SW1E, United Kingdom
Phone +44-736-62211

I do not know if he can be reached by e-mail.

My guess is that his reply to your question is that all
MTA-s which handle a common domain should have a common directory
system, in which they can find which MTA serves each indivudual
OR-address within their domain.