You can configure Attendee Online to send Confirmation Emails through SMTP after an attendee registers, accepts, or declines a registration. To do so, you first need to set up the options in the Confirmation section of the Configuration file.  See Server Configuration: Confirmation (Emails).

Next, you need to set up the three confirmation files - ConfirmationNew.html, ConfirmationAccept.html, and ConfirmationDecline.html - that have been added to the Files folder.  These files will set the "From" email address, subject, and message body of the confirmation emails. These files need to be set up with a proper "From" email address before you start using them. Also, the first two lines need to be formatted so the email and subject can be properly read. The remaining lines will be placed into the message body.

You can also include registration details as part of the body of the Confirmation email. Enter {%Details%} as a tag in the body to display the registration details at that location. Formatting registration details is handled in the same way as the RegItemControl on the RegDetailPage.  See Default Webpages: Registration Detail and Edit Webpages: RegItemControl Parameters.