The system can send out emails at different triggers. Each of this trigger, like a new reservation was made, has its own template and mostly one for the guest and one for the admin. You can customize these templates like forms with [tags]. They’re listed on the right and the most of them are very obvious.
The adminmessage works only in emails to the guest for that you can enter a text like approving, rejecting, mailing or editing.
Customs shows all custom information’s attached to the reservation after another with title and value, but you can use [customs title] to just show the value of a specific custom information. Further you can add the attribute else with a text to insert it if no custom field with the title can be found.
Prices does the same for price fields with its value and amount. If you add a title you can use the attribute hide to hide the amount or value. Further you can add the attribute else with a text to insert it if no price field with the title can be found.