BoxTrapper is very useful. It simply protects your inbox from spam by forcing all people not on your white list to reply to a verification email before they can send mail to you. However, this is not always ideal of your main email accounts such as sales/support due to everybody that emails in to have to verify that they are a human being. BoxTrapper is only useful for less used email accounts.
Spam Assissin is my favourite. With this you can set it to "auto delete" emails that are considered as SPAM and set a score rating. I use this for all email accounts. If Spam Assassin considers an email to be spam, it will add ***SPAM*** in the subject of every spam message.
How to stop SPAM from entering your WHMCS support ticket system:
You do not need to disable email piping! All you need to do is...
1. Login into your 'WHMCS' Admin area.
2. In 'Configuration' settings, click on 'Spam Control'
3. Click on 'Blocked Subjects' and enter ***SPAM*** in the text field (make sure you select 'Subject' option from the drop-down).
That's it, no more SPAM! Just make sure you have Spam Assassin switched on (from within your cPanel). Spam Assassin will automatically add the subject ***SPAM*** to all email considered as spam, and WHMCS will BLOCK all emails that contain the email subjects ***SPAM*** from entering the piping system.
This is a VERY neat and easy trick, and it works well. Any questions, feel free to comment
P.S: Anyone tried ClientExec software? - What a load of rubbish!