When a patient contacts the clinic telling you that he/she did not receive an appointment confirmation, you're able to resend this confirmation.
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To resend an appointment confirmation, search and find the appointment you wish to resend in the calendar. Click the appointment and scroll down in the pop-up. Click on the send again link.

Note: while walking through this procedure it's advisable to check the existing email address. Also, keep in mind that e-mails could end up in the spam box. Especially for certain email services like Gmail and Hotmail spam filters sometimes do show unexpecting behavior. 
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