Hello,
it depends on where you send the mail:
Online tools (tools.pdf24.org): In the form behind Email > To another person you can save your values as a template. Fill in To, Subject and the text once, click Save as new template next to Template and give it a name. Next time select this template in the Template list, and To, Subject and text are filled in. The templates are stored in your browser. The template has to be selected each time, the form always starts with "Default".
PDF24 Creator for Windows: There is currently no setting for a default recipient or text. If you print your documents to the PDF24 printer yourself, you can use control codes (since version 11.31.0): text markers such as @@to:name@example.com@@ and @@sa:Your text@@ in the printed document prefill the recipient and the text of the mail. They are switched on per printer in the PDF24 Settings with Recognize control codes in the printed document. Details are in the manual: https://creator.pdf24.org/manual/11/#62-control-codes-in-printed-documents
Thank you for the suggestion of fixed default values, we will add it to our list.