# Schedule Single Send ## API Overview A Single Send is a one-time, non-automated email message delivered to a list or segment of your audience. A Single Send may be sent immediately or scheduled for future delivery. Single Sends can serve many use cases, including promotional offers, engagement campaigns, newsletters, announcements, legal notices, or policy updates. The Single Sends API allows you to create, retrieve, update, delete, schedule, and deliver your Single Sends. There are also endpoints for searching and statistics to help you maintain and alter your Single Sends as you learn more and further develop your campaigns. The Single Sends API changed on **May 6, 2020**. Please check the SendGrid Knowledge Center for updates and instructions here: [https://sendgrid.com/docs/for-developers/sending-email/single-sends-2020-update/](/docs/sendgrid/for-developers/sending-email/single-sends-2020-update/) ## Operation overview ```json {"path":"https://api.sendgrid.com/v3/marketing/singlesends/{id}/schedule","method":"put","servers":[{"url":"https://api.sendgrid.com","description":"The Twilio SendGrid v3 API"}]} ``` **This endpoint allows you to send a Single Send immediately or schedule it to be sent at a later time.** To send your message immediately, set the `send_at` property value to the string `now`. To schedule the Single Send for future delivery, set the `send_at` value to your desired send time in [ISO 8601 date time format](https://www.iso.org/iso-8601-date-and-time-format.html) (`yyyy-MM-ddTHH:mm:ssZ`). ## Operation details ### Authentication API Key ### Headers ```json [{"in":"header","name":"Authorization","required":true,"default":"Bearer <>","schema":{"type":"string"}}] ``` ### Path parameters ```json [{"name":"id","in":"path","required":true,"schema":{"type":"string"}}] ``` ### Request body ```json {"schema":{"type":"object","required":["send_at"],"example":{"send_at":"3752-01-28T23:21:52.575Z"},"properties":{"send_at":{"type":"string","description":"The ISO 8601 time at which to send the Single Send. This must be in future or the string `now`. SendGrid [Mail Send](/docs/sendgrid/api-reference/mail-send/mail-send) emails can be scheduled up to 72 hours in advance. However, this scheduling constraint does not apply to emails sent via [Marketing Campaigns](/docs/sendgrid/ui/sending-email/how-to-send-email-with-marketing-campaigns/).","format":"date-time"}}},"encodingType":"application/json"} ``` ### Responses ```json [{"responseCode":"201","schema":{"description":"","content":{"application/json":{"schema":{"type":"object","properties":{"send_at":{"type":"string","description":"The ISO 8601 time at which to send the Single Send. This must be in future or the string `now`. SendGrid [Mail Send](/docs/sendgrid/api-reference/mail-send/mail-send) emails can be scheduled up to 72 hours in advance. However, this scheduling constraint does not apply to emails sent via [Marketing Campaigns](/docs/sendgrid/ui/sending-email/how-to-send-email-with-marketing-campaigns/).","format":"date-time"},"status":{"type":"string","enum":["scheduled"],"refName":"Status","modelName":"Status"}}},"examples":{"response":{"value":{"send_at":"3752-01-28T23:21:52.575Z","status":"scheduled"}}}}}}},{"responseCode":"404","schema":{"description":"","content":{"application/json":{"schema":{"type":"object","properties":{"errors":{"type":"array","items":{"type":"object","properties":{"field":{"type":"string"},"message":{"type":"string"},"error_id":{"type":"string"}}}}}}}}}},{"responseCode":"500","schema":{"description":"","content":{"application/json":{"schema":{"type":"object","properties":{"errors":{"type":"array","items":{"type":"object","properties":{"field":{"type":"string"},"message":{"type":"string"},"error_id":{"type":"string"}}}}}}}}}}] ``` Schedule Single Send ```js const client = require("@sendgrid/client"); client.setApiKey(process.env.SENDGRID_API_KEY); const id = "id"; const data = { send_at: "3752-01-28T23:21:52.575Z", }; const request = { url: `/v3/marketing/singlesends/${id}/schedule`, method: "PUT", body: data, }; client .request(request) .then(([response, body]) => { console.log(response.statusCode); console.log(response.body); }) .catch((error) => { console.error(error); }); ``` ```python import os from sendgrid import SendGridAPIClient sg = SendGridAPIClient(os.environ.get("SENDGRID_API_KEY")) id = "id" data = {"send_at": "3752-01-28T23:21:52.575Z"} response = sg.client.marketing.singlesends._(id).schedule.put(request_body=data) print(response.status_code) print(response.body) print(response.headers) ``` ```csharp using System; using System.Collections.Generic; using System.Threading.Tasks; using SendGrid; public class Program { public static async Task Main() { string apiKey = Environment.GetEnvironmentVariable("SENDGRID_API_KEY"); var client = new SendGridClient(apiKey); var id = "id"; var data = @"{ ""send_at"": ""3752-01-28T23:21:52.575Z"" }"; var response = await client.RequestAsync( method: SendGridClient.Method.PUT, urlPath: $"marketing/singlesends/{id}/schedule", requestBody: data); Console.WriteLine(response.StatusCode); Console.WriteLine(response.Body.ReadAsStringAsync().Result); Console.WriteLine(response.Headers.ToString()); } } ``` ```java import com.sendgrid.*; import java.io.IOException; import org.json.JSONObject; import java.util.HashMap; public class Example { public static void main(String[] args) throws IOException { try { SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY")); Request request = new Request(); request.setMethod(Method.PUT); request.setEndpoint("/marketing/singlesends/id/schedule"); request.setBody(new JSONObject(new HashMap() { { put("send_at", "3752-01-28T23:21:52.575Z"); } }).toString()); Response response = sg.api(request); System.out.println(response.getStatusCode()); System.out.println(response.getBody()); System.out.println(response.getHeaders()); } catch (IOException ex) { throw ex; } } } ``` ```go package main import ( "fmt" "github.com/sendgrid/sendgrid-go" "os" ) func main() { apiKey := os.Getenv("SENDGRID_API_KEY") host := "https://api.sendgrid.com" request := sendgrid.GetRequest(apiKey, "/v3/marketing/singlesends/id/schedule", host) request.Method = "PUT" request.Body = []byte(`{ "send_at": "3752-01-28T23:21:52.575Z" }`) response, err := sendgrid.API(request) if err != nil { fmt.Println(err.Error()) os.Exit(1) } else { fmt.Println(response.StatusCode) fmt.Println(response.Body) fmt.Println(response.Headers) } } ``` ```php /sendgrid-php.php'; $apiKey = getenv("SENDGRID_API_KEY"); $sg = new \SendGrid($apiKey); $request_body = json_decode('{ "send_at": "3752-01-28T23:21:52.575Z" }'); $id = "id"; try { $response = $sg->client ->marketing() ->singlesends() ->_($id) ->schedule() ->put($request_body); print $response->statusCode() . "\n"; print_r($response->headers()); print $response->body() . "\n"; } catch (Exception $ex) { echo "Caught exception: " . $ex->getMessage(); } ``` ```ruby require 'sendgrid-ruby' include SendGrid sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY']) data = JSON.parse('{ "send_at": "3752-01-28T23:21:52.575Z" }') id = "id" response = sg.client.marketing.singlesends._(id).schedule.put(request_body: data) puts response.status_code puts response.headers puts response.body ``` ```bash curl -X PUT "https://api.sendgrid.com/v3/marketing/singlesends/id/schedule" \ --header "Authorization: Bearer $SENDGRID_API_KEY" \ --header "Content-Type: application/json" \ --data '{"send_at": "3752-01-28T23:21:52.575Z"}' ```