By default, Reftab will send one overdue email to users in possession of items overdue for return. You can automatically configure additional overdue email notices to send. This feature is only available to accounts on Pro plan and up.
Log into Reftab as an administrator and click โSettingsโ > โAutomated Workflowsโ > โNew Workflowโ
Choose the trigger of โScheduleโ then set when you want the emails to send.
Click โAdd Conditionโ and set: โLoan due date less than nowโ
Click โAdd Actionโ and set: โSend Email Overdue Asset To Assets Loaneeโ

Click โSave Workflowโ when done.