To prevent collecting duplicate feedback, CloseAlert places a cookie in the browser with a validity for 1 hour. It is placed once the respondent redirects from the e-mail to the CloseAlert form.
If a respondent refreshes the web page whilst submitting an answer, responses already given will not be re-submitted. The database will re-load (and show) the feedback already given.

The cookie is identified with:

This means that, in order to determine whether a response is unique or a duplicate, the CloseAlert software will look for a combination of the above two. If there is a match, the respondent is not able to submit feedback again (within the same hour).

Tripolis does not include a mailing name in the URL. Instead it uses 'tripolis_job_id'. The 'tripolis_job_id' is treated as 'mailing name' in the above explanation.

In case a respondent has turned cookie capturing off (such as the use of incognito mode), CloseAlert will remove duplicate entries based on:

All will be removed, apart from the last one submitted. In case you have a follow-up notification active, only this response will be forwarded.