In the third step of creating your activity, you have the option to set a reminder to recipients. If you select this option, Pronotif will resend your email to recipients who have not opened it when it was first sent or who have not downloaded its attachments after 5 or 7 days.

In other words, if you set a reminder for your tenants who have not opened your email five days after it was initially sent, it will automatically be resent to them.