Does the CRM include reminders?
Yes. A follow-up can carry a reminder ahead of its due date, and the CRM notifies you again when the due date passes.
Give a follow-up a due date and, if you want one, a reminder at some point before it. The due date and the moment it goes overdue each raise a notification, and each fires exactly once rather than repeating until it is dealt with.
Notifications are set per event rather than with one switch for all of them: a new enquiry, a lead assigned to you, a lead that has gone quiet, a follow-up due or overdue, a viewing coming up, a listing published or refused. Each can be in the CRM, by email, both or off, and can arrive as it happens or once a day as a summary. Set them under Settings (the gear) → Notification preferences.