To stop sms text messages the client can simply reply "stop" to the text or login to their fons profile at https://fons.app, navigate to Settings->Profile and toggle off sms reminders.
There is not a way to stop the email notifications with in the app however you can customize the notifications you see by creating a rule in your email client.
Here are some of the most popular email clients and instructions on creating rules to filter your emails:
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