I wouldn’t be too concerned about the duplicate content issues because:

a) it’s not a value content page. Do you really care if a ‘thanks page’ gets listed in Google with a parameter on it. WHat would it rank for anyway? It wouldn’t have any internal site links to it – only from the email!
b) People aren’t going to link to this page.

If you are bothered about it then feel free to exclude the page from the google index or use canonical tags. But I can’t see the issue.

How many people actually click through from the email to the phone tracking page depends largely on how you go about it and how you word the email. Make it sound super important and clear that they should click through and more people will do it.

In our experience we have found about 50%-70% of customers via this route actually register a conversion.

Of course you need to implement a good way of reconciling the actual phone sales with phone conversions so you can uplift the values you are seeing in analytics accordingly.

This addresses a problem that can be huge, and that is very easy to have go unnoticed.

I’m hestant to add URL parameters, due to duplicate content concerns. Do you have any thoughts on this?

This post is brilliant because it points out a problem that may go unnoticed and because the soltions are so clever.

This is a great article, and very well presented, especially for an often over-complicated topic.

Love the idea of capturing the user’s email address over the phone, then using it to reconcile AdWords and Analytics cookies. Sounds extremely simple and effective, but I’d be interested to know the response rate of emails sent to clicks received.

Alan