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I did not see an option to change the from email address for Appointment + Notifications, and was a concerned because the WP Mail SMTP plugin we are using for WordPress asked me to define a “From Email”, which differs from the admin email address. I can see Appointment+ uses the email set in Settings > General.
I don’t think it is wise to change this address for Appointment notifications as it may affect other plugins and their notifications. It will be better if there is an option for set the from email address for Appointment + Notifications.