[Mailman-Users] Mailman 2.1.11 - message appears to drop on the floor

[Andrew Hodgson]

Hi,

I have a list with a user who is not able to send new messages to the
list - replies go out ok, but whenever he sends out a new message, it
doesn't reach the list.

I have a relay machine which accepts the message and does antivirus
checks etc which is my main mailhub on the end of a DSL line.  This
relays to a Debian machine running Mailman 2.1.11 and Exim4 as the mail
receiver.  This is using the Exim4 and Mailman howto on the Exim website
- that is, using transports and routers in the Exim configuration to
work out the Mailman lists, and piping to the Mailman receiver 

I have tracked the message going through the main relay, and to the Exim
machine.  I can see it going through the Mailman transport, but nothing
after this:

(names changed to protect the innocent)

2008-09-08 16:45:56 1Kciw8-0003PY-35 <=
SRS0=FU6r=ZS=domain.com=username at srs.per
fora.net H=gollum.hodgsonfamily.org [81.2.105.210] P=esmtp S=4728
id=C6C9F90C58A
0864585D0B51A8EF1C87434F58308 at winxbeus07-r.exchange.xchg
2008-09-08 16:45:56 1Kciw8-0003PY-35 => blind-sysadmins
<blind-sysadmins at lists.h
odgsonfamily.org> R=mailman_router T=mailman_transport
2008-09-08 16:45:56 1Kciw8-0003PY-35 Completed

I have checked files in /var/lib/mailman/logs and there is nothing shown
for that time.

Any ideas?
Thanks.
Andrew.