Sourceval sendgrid_url : string Sourceval send_one :
?reply_to:??? ->
api_key:string ->
dst:(string * string option) ->
from:(string * string option) ->
subject:string ->
(string * string) list ->
(unit, string option EzReq_lwt_S.api_error) result Lwt.t Sourceval send_template :
?reply_to:??? ->
api_key:string ->
dst:(string * string option) list ->
from:(string * string option) ->
string ->
string ->
(unit, string option EzReq_lwt_S.api_error) result Lwt.t