src virtual override Void encode(OutStream out)

Encode as a MIME message according to RFC 822.

src File? file

File content

src new make()

Construct with default type of "text/plain".

src virtual override Void validate()

Validate this part - throw Err if not configured correctly:

• file must be non-null
• if Content-Type not set, defaults to file.mimeType
• if Content-Type name param not set, defaults to file.name
• Content-Transfer-Encoding must be base64