Use the 
http://jmeter.apache.org/usermanual/component_reference.html#User_Parameters
User Parameters  control, add a var called 'foobar' with User 1 set to:

JM${__time()}_${__threadNum()}

This return a number that will always be unique. Set it to Update Once Per
Iteration (in case you need to refer back to it).

You could also just create a var called 'email' like this:

JM${__time()}_${__threadNum()}@MYDUMMYDOMAIN.com

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