[Koha] Sending Email to User

Hello everybody, the first time when we create a new user (patron) , we send an email using koha, but how do we send an email to inform the patron that has to return a borrowed book? Of course,when the date is over. Thanks -- *Luis Moisés Rojas P.* <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Libre de virus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>