[Exim] How to ?

Hello all, and happy new year !

How can set the file size limit to 8Mb :
[root@pcDev log]# grep 1Adp6o-00059p-Mr *
mainlog:2004-01-06 12:23:36 1Adp6o-00059p-Mr malware acl condition:
clamd:
ClamAV returned
/var/spool/exim/scan/1Adp6o-00059p-Mr/1Adp6o-00059p-Mr-00000.zip: File
size
limit exceeded. ERROR
mainlog:2004-01-06 12:23:36 1Adp6o-00059p-Mr H=(deadbert.skynet.be)
[195.238.3.131] F=<Eric.CHANNAUX@???> temporarily rejected after
DATA
paniclog:2004-01-06 12:23:36 1Adp6o-00059p-Mr malware acl condition:
clamd:
ClamAV returned
/var/spool/exim/scan/1Adp6o-00059p-Mr/1Adp6o-00059p-Mr-00000.zip: File
size
limit exceeded. ERROR
rejectlog:2004-01-06 12:23:36 1Adp6o-00059p-Mr H=(deadbert.skynet.be)
[195.238.3.131] F=<Eric.CHANNAUX@???> temporarily rejected after
DATA
rejectlog:      id 1Adp6o-00059p-Mr

Thanks in advance

Guy