All of the commands below are run as 'root'.

/etc/init.d/exim stop
mv /usr/sbin/sendmail /usr/sbin/sendmail.hidden

pico /usr/sbin/sendmail

Add the following:

#!/usr/local/bin/perl

# use strict;
use Env;
my $date = `date`;
chomp $date;
open (INFO, ">>/var/log/spam_log") || die "Failed to open file ::$!";
my $uid = $>;
my @info = getpwuid($uid);
if($REMOTE_ADDR) {
print INFO "$date - $REMOTE_ADDR ran $SCRIPT_NAME at $SERVER_NAME n";
}
else {

print INFO "$date - $PWD - @infon";

}
my $mailprog = '/usr/sbin/sendmail.hidden';
foreach (@ARGV) {
$arg="$arg" . " $_";
}

open (MAIL,"|$mailprog $arg") || die "cannot open $mailprog: $!n";
while (<STDIN> ) {
print MAIL;
}
close (INFO);
close (MAIL);


save and then

chmod +x /usr/sbin/sendmail
touch /var/log/spam_log

chmod 0777 /var/log/spam_log
/etc/init.d/exim start
tail - f /var/log/spam_log




pico /etc/logrotate.conf

FIND:
# no packages own wtmp -- we'll rotate them here
/var/log/wtmp {
monthly
create 0664 root utmp
rotate 1
}

ADD BELOW:

# SPAM LOG rotation
/var/log/spam_log {
monthly
create 0777 root root
rotate 1
}

Save file and exit.


chattr +i/usr/sbin/sendmail

Courtesy of Mora @ alkema4host.com