Problem - Google indexed a url with the email tracking string

[asher02]

Hi all,

I just saw that Google indexed a page of mine that has a tracking code "domain/?source=blabla" this page is live on Google and is not on my server, I only used it on email for tracking campaigns.

The page that shows is exactly as my home page as this string can be anything... how can I give a 404 error for this page....?

It worries me because as I see a competitor can post link to a site with these strings and since the page is 200ok Google will index it and maybe cause a duplicate penalty....mmmm

[tedster]

In a related thread [webmasterworld.com], g1smd gave one solution:

...have a script ON the page that detects "by which name was this page asked for"
and get that script to add the [robots] meta tag if the name includes any parameters, and
omit the meta tag when it does not.

[asher02]

Thanks tedster for the advise, but I am looking for an other way without overloading my code.

Is there a way to do that using htaccess or robot text?

As it seems Google sort it out try
www.google.com/?source=problem

Yahoo did not..try
[yahoo.com...]

If Google can do it sure I can :)

Any suggestions are welcome.