Appointment Reminders: Email Status

Emails for both immediate appointment confirmations as well as appointment reminders are sent to our SMTP vendor in an email queue and then usually sent out in batches. This is a standard practice in order to avoid being blacklisted by other SMTP and email vendors ( such as Google, Yahoo, Outlook, etc ) as a spam domain. It also helps us to ensure delivery through common SMTP failure points with vendor-provided tools to ensure delivery.
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Unfortunately this makes programmatically following up on the status of a specific email difficult due to a number of reasons. That said, if there are particular email addresses that you are worried about not receiving an email, we can check those and see if there was any SMTP Recipients Refused code returned by our vendor for it in our various logs which would indicate either that the user has blocked emails from the domain or if there were issues with delivery.