If it is a one-off, why not take out a free trial of Articulate Online? It runs for 30 days and you and your client will be able to run off elaborate reports easily and quickly. Plus you'll be able to publish the quiz direct from Quizmaker to Articulate Online. You'll even be able to customize the account with their logo etc.
You can set up your trial here in just a few seconds:
Articulate - Free Trials
Of course, your client may be so impressed, they'll want to subscribe to it after the trial has finished ! But if they don't, the account will just cease to work.
Otherwise, the email should work but there are occasional issues from some machines so it is always better to go the LMS route if you can.
If you are up for a little tweaking, then some of our customers are successfully sending Quizmaker results via PHP, or using a database, but these methods are not supported by Articulate. You can learn more here:
Articulate '09 - Email Results Tutorial - PHP
Quiz to database, instructions and code
There are also some LMSs like Dokeos on which you can store content for free provided that you don't go over a certain Mb limit. It won't be customized for your client but it will be user-access protected.
Regards