This shouldn't be much of a problem as:
1) You have a unique ID for each recipient
2) You could add this ID to each trackable link
3) Store this information in the database
4) You could match this ID to a friendly database username (Full Name)
This way you could generate nice statistic pages:
A) Which pages have been clicked by which user
B) Which users clicked which pages (so the other way round)
This would make a great product even better

Regards,
Oliver