[Exim] Debug log added on to end of mails?!?

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Author: Lorens Kockum
Date:  
To: exim-users
Subject: [Exim] Debug log added on to end of mails?!?
This morning I found several if not all of new incoming mails
with lines such as the following tacked on the bottom. I have
not been able to reproduce it on today's mail.

Data file written for message 15I9ug-0003Rj-00
Writing spool header file
Size of headers = 1678
LOG: 0 MAIN <= xxxx H=xxx [...] U=postfix P=esmtp S=2256
id=xxxx

The lines can only have been put by my exim.

I am using a very recently compiled exim 3.31 (day before
yesterday). Yesterday (never before) I had some problems with
the machine (one /bsd: vm_fault followed by "syncing disks" and
kernel debugger, and one that only left a panic "syncing disks"
in the log). I am trying to determine whether it's the brand new
exim (not running as root), the 18 month old OS install, or the
mostly 6 month old hardware.

I have therefore put -d12 -df on the exim options in inetd.conf.
According to docs, that should cause stderr output, not
additions to the bodies of the mail.

I have seen some

2001-07-03 23:13:32 15HXUB-0001R6-00 Format error in spool file 15HXUB-0001R6-00-H: size=2199
2001-07-03 23:13:32 15HXUB-0001R6-00 Message removed because older than 4d

but these Format errors do not correspond to messages with extra
lines.

So,

1) am I seeing something exim shouldn't do, pointing to a
serious problem?

2) is the spec of the -d option incomplete?

3) can this conceivably have been provoked by a not-quite brutal
halt of the machine (disks synced)?

-- 
#include <std_disclaim.h>                          Lorens Kockum
<Private P.S. Yes, I have to change my subscription address.>