[exim] Double spamd scanning exim/vexim

Hi,

I'm a relatively new to exim/vexim and had an installation running
for a while...

Watching logs this evening I've noticed messages seem to be being
scanned twice:

Dec 29 01:52:22 thor spamd[16285]: connection from localhost
[127.0.0.1] at port 49455
Dec 29 01:52:22 thor spamd[16285]: checking message
<43B34137.8040708@???> for maildeliver:888.
Dec 29 01:52:28 thor spamd[16285]: clean message (-0.8/4.8) for
maildeliver:888 in 5.0 seconds, 5502 bytes.
Dec 29 01:52:28 thor spamd[16285]: result: . 0 -
BAYES_00,J_CHICKENPOX_81,RCVD_IN_SORBS,SPF_HELO_PASS,TW_BW,TW_GT
scantime=5.0,size=5502,mid=<43B34137.8040708@???>,bayes=5.55111
512312578e-17,autolearn=no
Dec 29 01:52:28 thor spamd[16286]: connection from localhost
[127.0.0.1] at port 49460
Dec 29 01:52:28 thor spamd[16286]: checking message
<43B34137.8040708@???> for spam:888.
Dec 29 01:52:30 thor spamd[16286]: clean message (-0.8/4.8) for spam:
888 in 3.4 seconds, 5502 bytes.
Dec 29 01:52:30 thor spamd[16286]: result: . 0 -
BAYES_00,J_CHICKENPOX_81,RCVD_IN_SORBS,SPF_HELO_PASS,TW_BW,TW_GT
scantime=3.4,size=5502,mid=<43B34137.8040708@???>,bayes=5.55111
512312578e-17,autolearn=no

Anyone got any clues as to where to start looking for this double
scanning issue?

TIA

Darren