Hello guys.
1) No configuration for the front end.
2) Yes: you need a development on SDK side.
3) Yes it is possible.
If you want to send a simple email with a text containing some informations, or with a custom attachment, you just need to read the following blog.
How to send an email with attachments in SAP Cloud Application Studio
In case you want to attach the standard quotation attachment that by standard is generated when the sales quote is approved, you need to have a look here:
