Hello,
PHP and Apache are not being able to track which users are sending out mail through the PHP mail function from the nobody user causing leaks in formmail scripts and malicious users to spam from your server without you knowing who or where.

Monitiring exim_mainlog doesn’t exactly help, you see th email going out but you can’t track from which user or script is sending it. This is a quick and dirty way to get around the nobody spam problem on your Linux server.

If you check out your PHP.ini file you’ll notice that your mail program is set to: /usr/sbin/sendmail and 99.99% of PHP scripts will just use the built in mail(); function for PHP - so everything will go through /usr/sbin/sendmail
Requirements:

We assume you’re using Apache 1.3x, PHP 4.3x and Exim. This may work on other systems but we’re only tested it on a
Cpanel/WHM Red Hat Enterprise system.

Step 1:

Login to your server with root.

Step 2:
Turn off exim before proceeding
service exim stop

Step 3:
Take the Backup of  your original /usr/sbin/sendmail file

mv /usr/sbin/sendmail /usr/sbin/sendmail_bak

Step 4:

You need to  Create the spam monitoring script for the new sendmail.
pico /usr/sbin/sendmail

Paste in 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 close

Step 5:
Now change the new sendmail permissions
chmod a+x /usr/sbin/sendmail

Step 6:

Create a new log file to keep a history of all mail going out of the server using web scripts
touch /var/log/spam_log

chmod 0777 /var/log/spam_log

Step 7:
Start Exim up again.
/etc/init.d/exim start

Step 8:
You can Monitor your spam_log file for spam, try using any formmail or script that uses a mail function - a message board, a contact script.
tail - f /var/log/spam_log

Reference taken from : webhostgear.com

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Wish to resell Web hosting?

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A reseller buys a hosting package from a hosting company and then sells it in small parts to clients independently. As a reseller you create your own hosting plans you are free to resell each plan under your own brand name and set a price for those plans yourself. You have full control over all of your clients’ hosting packages via a central reseller control panel. You can add, remove and modify any of your clients’ domains within your reseller hosting plan directly from this central control panel, called web host manager.

Start small if you are very new to the concept of web hosting reselling business, and then you can expand as you get more and more customers. To become a reseller, you don’t need to have a lot of technical knowledge, but some sales and internet marketing knowledge is required. Also, you do not require a lot of upfront investment. All you need is a decent computer for your customer accounts management, and a good Internet connection.

A reseller buys hosting package from a hosting company and then tries to sell it independently. As a reseller you are free to resell each plan under your own brand name and charge your customers with the rate as you feel good. As a reseller you can decide what kinds of services you will sell. You can provide shared hosting, dedicated hosting, or co-location hosting. Start small if you are very new to the concept of reselling. To become a reseller, you don’t need to have a lot of technical knowledge, but some sales and internet knowledge is required. All you need is decent computer for your customer accounts management, and a good internet connection.