The first thing you want to check is your Default Mail Sender. Navigate to Admin > Configuration > System Settings then scroll down to the Mail section of the system settings.
If your Default Mail Sender field is not set up, or displays -Custom-, this is why.
Reach out to support in to let the team know you would like to update the preferred Default Mail Sender email address field in your system settings along with the email address you would like to use.
But there is an email address in the Default Mail Sender field, why aren't my System Emails sending?
The best thing to do is to check the log on the customer profile. Go to the Booker and search for the customer who is not receiving their emails from zingfit. Select Log.
If the email is listed in the log, prompt the customer to check their spam folder.
If the email is not listed in the log, please reach out to support so they can best assist.
It's important to list the customer example and the email that failed to send.