Tracking emails - the right way.

I need to put a function on my emails where we can track the initial link that is being clicked.  The way I currently do this is to put a small php/asp script onto the website and add the script onto the hyperlink - something like this:

https://www.website.com/tracking.php?ID=123456789&PID=meetingaccepted

When the script runs, it takes the user to the relevant page (PID) and sends an email with the ID number to a designated email address (that can then be processed). This function is going to be used by several companies, so I need to minimise what I ask them to do when setting things up.  

Historically the companies that have used an early version of this function have been fine with adding a small php/asp script to their site and setting up a mailbox.

Ultimately, the marketing guys just need the ID, whereas the Tech guys need to be happy (security, ease of implementation etc.). So, is this a good way to do it - or is there a better method?  

Thanks.