[Exim] "Unrouteable address" : what does this mean?

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Author: Rory Campbell-Lange
Date:  
To: exim-users
Subject: [Exim] "Unrouteable address" : what does this mean?
I have see a number of "Unrouteable address" messages that quickly
bounce mail emanating from our network back to the sender.

Queries:
         a. Does 'Unrouteable' here mean there is no route configured,
            or that something like a DNS error occurred?
         b. I just don't know where 'dip.t-dialin.net' comes from!


2004-01-21 15:59:35 1AjKlT-0000nI-VE no IP address found for host dip.t-dialin.net
2004-01-21 15:59:37 1AjKlT-0000nI-VE <= user.f@??? H=mhpnt1 (mhp_nt1.mydomain.co.uk) [10.0.0.24] P=esmtp S=2086
2004-01-21 15:59:58 1AjKlT-0000nI-VE ** sender.m@??? <sender.m@???>: Unrouteable address
2004-01-21 15:59:58 1AjKlT-0000nI-VE => sender.m <sender.m@???> R=shadow_all T=shadow_delivery
2004-01-21 15:59:58 1AjKlq-0000nR-EQ <= <> R=1AjKlT-0000nI-VE U=mail P=local S=2897
2004-01-21 15:59:58 1AjKlT-0000nI-VE Completed

2004-01-21 17:29:01 1AjMA1-0001Da-NH no IP address found for host dip.t-dialin.net
2004-01-21 17:29:02 1AjMA1-0001Da-NH <= user2.r@??? H=mhpnt1 (mhp_nt1.mydomain.co.uk) [10.0.0.24] P=esmtp S=2671
2004-01-21 17:29:10 1AjMA1-0001Da-NH ** sender.2@??? <sender.2@???>: Unrouteable address
2004-01-21 17:29:10 1AjMA1-0001Da-NH => sender.2 <sender.2@???> R=shadow_all T=shadow_delivery
2004-01-21 17:29:11 1AjMAA-0001Dj-W1 <= <> R=1AjMA1-0001Da-NH U=mail P=local S=3501
2004-01-21 17:29:11 1AjMA1-0001Da-NH Completed

--
Rory Campbell-Lange
<rory@???>
<www.campbell-lange.net>