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:(Email_message__.Headers.Name.t * Email_message__.Headers.Value.t) list -> ?attachments:(attachment_name * Content.t) list -> Content.t -> t
val content : whitespace:Email_message__.Headers.Whitespace.t -> extra_headers:(Email_message__.Headers.Name.t * Email_message__.Headers.Value.t) list -> encoding:Email_message.Octet_stream.Encoding.known -> string -> t
val multipart : whitespace:Email_message__.Headers.Whitespace.t -> content_type:Mimetype.t -> extra_headers:(Email_message__.Headers.Name.t * Email_message__.Headers.Value.t) list -> t list -> t