The supply order is sent to the supplier to order a service. The default text for the supply order is the supply order template.
To configure the format of the email used to send the supply order use the settings: SupplyOrderEmailSubject, SupplyOrderEmailSubject / SupplyOrderEmailBody, SupplyOrder-HeaderTitle and SupplyOrderTextOnlyEmailSubject
There are two different versions of the supply order: with or without the flight details. Which one is used depends on the setting UseBlankSupplyOrder.
To send a supply order as text (not pdf) use the Text-only supply order.
See also
Variables in Supply order
How to configure supply order templates
How to configure Acrobat Reader