include sig ... endval bin_t : t Bin_prot.Type_class.tval bin_read_t : t Bin_prot.Read.readerval __bin_read_t__ : (int ‑> t) Bin_prot.Read.readerval bin_reader_t : t Bin_prot.Type_class.readerval bin_size_t : t Bin_prot.Size.sizerval bin_write_t : t Bin_prot.Write.writerval bin_writer_t : t Bin_prot.Type_class.writerval bin_shape_t : Bin_prot.Shape.tval create : ?from:[ `Keep | `Change_to of Email_address.t ] ‑> ?to_:[ `Keep | `Change_to of Email_address.t list ] ‑> ?cc:[ `Keep | `Change_to of Email_address.t list ] ‑> ?subject:[ `Keep | `Prepend of string ] ‑> Email.Simple.Content.t ‑> t