redirect an uncookied person away from URL?

[Charles_Sander1]

Here's our scenario:

A lead receives an email, sending them to a landing page. On the landing page, is an iframed piece of content. This content contains a token from the lead, that populates the correct iframed content for them.

Then....They forward their email to person #2 ... or, maybe they send the actual Landing Page URL.  Person #2 is not in our database.

What I'm hoping is that maybe there's a way to redirect people to another location, if they arrive at the URL and appear to be a new, previously un-cookied person?

Thoughts?

[SanfordWhiteman]

If the URL self-identifies the lead (as is the case with a Marketo tracked link, you're not really explaining what you mean by "token" here) then you can't tell the difference between one person who has that link and another.