type t = [ | `Send_now |
| `Send_at of Core.Time.t |
| `Sending |
| `Frozen |
| `Removed |
| `Quarantined of string |
| `Delivered |
]include sig ... endval t_of_sexp : Sexplib.Sexp.t ‑> tval __t_of_sexp__ : Sexplib.Sexp.t ‑> tval sexp_of_t : t ‑> Sexplib.Sexp.t