pub fn mixed_entity(
body: &str,
files: &[Attachment],
original: Option<&[u8]>,
flowed: bool,
) -> Result<String>Expand description
The MIME entity (Content-Type header + body, CRLF endings) for a draft body with attachments: multipart/mixed with the text first, files base64-encoded, and optionally the forwarded original as message/rfc822 (mutt’s mime_forward). The caller puts it under the draft’s top-level headers, or inside a PGP layer.