03-20-2019 03:56 AM
03-20-2019 04:02 AM - edited 03-20-2019 04:22 AM
@PaulJennings Microsoft Flow would be a candidate for this, this article has a run through, it may take some trial and error but I think it's close to what you are after:
This would use a SharePoint list to hold the information on the client details which the Flow would use to check and send reminders accordingly, here is a quick guide on this - Create a list in SharePoint.
Finally, this might be of interest and a good place to start - Using Flow to send Email Reminder from SharePoint Data.