pub fn render_rfc822(message: &Message) -> Result<Vec<u8>, MessageRenderError>Expand description
Render a structured Message as RFC822/MIME bytes.
§Encoding choices
Non-ASCII Body::Text and Body::Html values are
always rendered with Content-Transfer-Encoding: base64. ASCII text bodies
whose physical lines would exceed RFC 5322’s 998-octet hard limit are
rendered with Content-Transfer-Encoding: quoted-printable. A message
parsed from quoted-printable bytes through parse_rfc822 and rendered
back through this function will therefore round-trip with a different
Content-Transfer-Encoding. Callers that need quoted-printable for
near-ASCII bodies can construct a MimePart::Leaf
with an explicit content_transfer_encoding and use Body::Mime.
§Errors
Returns MessageRenderError when headers or MIME parts cannot be rendered
according to this crate’s RFC822 constraints.