val create_raw : ?from:string ‑> to_:string list ‑> ?cc:string list ‑> ?reply_to:string list ‑> subject:string ‑> ?id:string ‑> ?in_reply_to:string ‑> ?date:string ‑> ?auto_generated:unit ‑> ?extra_headers:(Headers.Name.t * Headers.Value.t) list ‑> ?attachments:(attachment_name * Content.t) list ‑> Content.t ‑> t
val content : whitespace:Headers.Whitespace.t ‑> extra_headers:(Headers.Name.t * Headers.Value.t) list ‑> encoding:Octet_stream.Encoding.known ‑> string ‑> t
val multipart : whitespace:Headers.Whitespace.t ‑> content_type:Mimetype.t ‑> extra_headers:(Headers.Name.t * Headers.Value.t) list ‑> t list ‑> t