Steps to reproduce:

1. Check out an item to a patron. The circulation rule activated by the patron/item combo sets the due date one hour into the future, and says that a courtesy notice should be sent out 1 minute before the loan expires, the first overdue notice 1 minute after, the second 2 minutes after, and the third 3 minutes after.

2. Wait three hours.

3. Verify that the loan has expired, and check the patron's email inbox.
   

Expected result:
The patron has received one courtesy notice and three overdue notices.

Actual result:
The patron has not received any courtesy or overdue notices.

Since receipts and recall notices are being sent out (and received) just fine, we suspect that this issue is specifically affecting notices that are set to be triggered by the due date expiring.

_**~

We're suspecting that no overdue notices are sent to patrons by e-mail. Last week, several patrons claimed that they have not received any reminder for their overdue items. We, the system librarians, have tested a few loan types/patron groups/e-mail domains, and can confirm that we are not seeing any overdue notices.

We don't know how to see for how long the overdue notices has been failing, maybe since going live? Is there a way we can check this?

Some other types of notices seems to work fine, for example recalls and loan receipts.

We continue the testing on our part and will report our findings, but need this to be urgently investigated from your side as well. Thanks!