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EPN stands for Expiring Password Notification. It is a standalone tool designed to build a list of users whose password would expire in the near future, and either display the list in a machine-readable format, or send email notifications to these users. EPN provides command-line options to display the list of affected users. This provides data introspection and helps understand how many emails would be sent for a given day, or a given date range. The command-line options can also be used by a monitoring system to alert whenever a number of emails over the SMTP quota would be sent. EPN is meant to be launched once a day from an IPA client (preferred) or replica from a systemd timer. EPN does not keep state. The list of affected users is built at runtime but never kept. TLS/STARTTLS SMTP code is untested and unlikely to work as-is. Parts of code contributed by Rob Crittenden. Ideas and feedback contributed by Christian Heimes and Michal Polovka. Fixes: https://pagure.io/freeipa/issue/3687 Signed-off-by: François Cami <fcami@redhat.com> Signed-off-by: Rob Crittenden <rcritten@redhat.com> Reviewed-By: Michal Polovka <mpolovka@redhat.com> Reviewed-By: Christian Heimes <cheimes@redhat.com>