Bon, j'ai localisé :
Il s'agit de spamd :
Mar 27 07:10:03 nova spamd[5780]: spamd: connection from localhost
[127.0.0.1] at port 53724
Mar 27 07:10:03 nova spamd[5780]: spamd: setuid to Debian-exim succeeded
Mar 27 07:10:03 nova spamd[5780]: spamd: processing message
<28043155.1174960520703.JavaMail.accucast@216.239.114.150> for
Debian-exim:100
Mar 27 07:10:04 nova kernel: spamd(5780): floating-point assist fault at
ip 200000000031e952, isr 0000020000003001
Mar 27 07:10:11 nova spamd[5780]: spamd: identified spam (13.6/5.0) for
Debian-exim:100 in 8.3 seconds, 45142 bytes.
Mar 27 07:10:11 nova spamd[5780]: spamd: result: Y 13 -
AWL,BAYES_99,HEAD_ILLEGAL_CHARS,HTML_90_100,HTML_IMAGE_RATIO_06,HTML_MESSAGE,MIME_HTML_ONLY,NORMAL_HTTP_TO_IP,NUMERIC_HTTP_ADDR
scantime=8.3,size=45142,user=Debian-exim,uid=100,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=53724,mid=<28043155.1174960520703.JavaMail.accucast@216.239.114.150>,bayes=1,autolearn=no
plus de 8 secondes par mail <Confus>
si qqun a une idée ...