I'm not sure how the bounce emailing (
en.wikipedia.org/wiki/Non_delivery_report) in Limesurvey works in general, but doesn't that just mean you get a "the user doesn't exist" or similar message from the email provider?
So when using test email addresses like "
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" you won't receive a bounce email, because the "wreoughrewough" domain won't exist. If you use "
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" for testing, you should receive bounce emails.