"The Mail has been sent already"?

"The Mail has been sent already"?

We are testing out the password expiration tool.  I have it up and running, and have it set to alert our users 14 days prior.  However looking at the report I'm seeing "The Mail has been sent already" notice next to a lot of users.  Does this mean the users only get a single email about their password expiring?  I want them to get one daily, not just a single time.

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