If you run mailscanner please make sure it is up to date. Here
is a tip from the creator of the software package.
Some of the virus scanner "wrapper" and "autoupdate" scripts
have been updated in version 4.24. If upgrading from earlier
versions using the RPM distributions, you will need to manually
rename each of the /usr/lib/MailScanner/*.rpmnew files over the
top of the old scripts in the same directory. To do them all at
once, you can do this:
sh cd /usr/lib/MailScanner for NEW in *-wrapper.rpmnew
*-autoupdate.rpmnew do echo $NEW ... F=`echo $NEW | sed -e
's/\.rpmnew//'` [ -f $F ] && mv -f $F ${F}.rpmold mv -f $NEW $F
done exit