Dear, I am just wondering, a lot of the people order hosting pakage and start spamming. Spamming on company's email server will get them blacklisted by many anti-spam filters around the world. This kind of damage not only affects only company, but all of their clients. Then how do you prevent your users from spamming across the world. What technique or software do you use?
On Spam Prevention using WHM As the shared IP in question here belonged to a WHM server we run, we will cover some WHM settings that could go a long way in the fight against clients who like to spam. Load up WHM as root and click through to Main >> Server Configuration >> Tweak Settings and scroll down to mail. There are two very useful settings here. The maximum each domain can send out per hour This is quite self explanatory, set it to a low number rather than the default of 0 which is unlimited and each domain is seriously halted when it comes to sending bulk mails. Prevent the user "nobody" from sending out mail to remote addresses Some poorer auto mailing scripts will send mail out as the user nobody, set this setting to enabled and this decreases the risk too. We hope these notes can be of use to individuals and companies alike in the ongoing fight against spam. source = http://www.madcapsule.com/blog/index.php/cpanel-spamming-clients
The best way to prevent spam is to monitor the server regularly although the above mentioned techniques will help to reduce the amount of spam. But there are advanced spamming techniques and to trace it would be very difficult , so you need to be alert if you have a dedicated server with shared hosting
Hi, Refer this link http://www.smashingmagazine.com/2006/12/14/preventing-spam-bulletproof-solution/ you will get clear idea about it.
Dont forget to check the blacklists every now and then for your main/shared IP's, they will surprise you sometimes.