Send a follow-up in the same thread as a sent email

Queues a new email threaded under the given send (In-Reply-To / References point at it, subject becomes Re: <original>), quoting the original below the new content. Works before any reply has arrived — use it for sequence follow-ups that must land in the same conversation. Billed like POST /v1/send.

curl -X POST "https://api.supasend.io/v1/send/507f1f77bcf86cd799439011/reply" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{
  "body_html": "example_string",
  "body_text": "example_string",
  "to": "user@example.com",
  "subject": "example_string",
  "ip_id": "example_string",
  "quote_history": true,
  "quote_timezone": "America/New_York",
  "headers": {},
  "scheduled_at": "2024-12-25T10:00:00Z"
}'

import requests
import json

url = "https://api.supasend.io/v1/send/507f1f77bcf86cd799439011/reply"
headers = {
  "Content-Type": "application/json",
  "X-API-Key": "YOUR_API_KEY"
}
data = {
  "body_html": "example_string",
  "body_text": "example_string",
  "to": "user@example.com",
  "subject": "example_string",
  "ip_id": "example_string",
  "quote_history": true,
  "quote_timezone": "America/New_York",
  "headers": {},
  "scheduled_at": "2024-12-25T10:00:00Z"
}

response = requests.post(url, headers=headers, json=data)
print(response.json())

const response = await fetch("https://api.supasend.io/v1/send/507f1f77bcf86cd799439011/reply", {
  method: "POST",
  headers: {
  "Content-Type": "application/json",
  "X-API-Key": "YOUR_API_KEY"
},
  body: JSON.stringify({
  "body_html": "example_string",
  "body_text": "example_string",
  "to": "user@example.com",
  "subject": "example_string",
  "ip_id": "example_string",
  "quote_history": true,
  "quote_timezone": "America/New_York",
  "headers": {},
  "scheduled_at": "2024-12-25T10:00:00Z"
})
});

const data = await response.json();
console.log(data);

package main

import (
    "fmt"
    "net/http"
    "bytes"
    "encoding/json"
)

func main() {
    data := []byte(`{
  "body_html": "example_string",
  "body_text": "example_string",
  "to": "user@example.com",
  "subject": "example_string",
  "ip_id": "example_string",
  "quote_history": true,
  "quote_timezone": "America/New_York",
  "headers": {},
  "scheduled_at": "2024-12-25T10:00:00Z"
}`)

    req, err := http.NewRequest("POST", "https://api.supasend.io/v1/send/507f1f77bcf86cd799439011/reply", bytes.NewBuffer(data))
    if err != nil {
        panic(err)
    }

    req.Header.Set("Content-Type", "application/json")
    req.Header.Set("X-API-Key", "YOUR_API_KEY")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    fmt.Println("Response Status:", resp.Status)
}

require 'net/http'
require 'json'

uri = URI('https://api.supasend.io/v1/send/507f1f77bcf86cd799439011/reply')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['X-API-Key'] = 'YOUR_API_KEY'
request.body = '{
  "body_html": "example_string",
  "body_text": "example_string",
  "to": "user@example.com",
  "subject": "example_string",
  "ip_id": "example_string",
  "quote_history": true,
  "quote_timezone": "America/New_York",
  "headers": {},
  "scheduled_at": "2024-12-25T10:00:00Z"
}'

response = http.request(request)
puts response.body

{
  "id": "example_string",
  "status": "queued",
  "thread_id": "example_string",
  "message_id": "example_string",
  "in_reply_to": "example_string",
  "references": [
    "example_string"
  ],
  "subject": "example_string",
  "to": "example_string",
  "scheduled_at": "2024-12-25T10:00:00Z"
}

{
  "error": "Bad Request",
  "message": "The request contains invalid parameters or malformed data",
  "code": 400,
  "details": [
    {
      "field": "email",
      "message": "Invalid email format"
    }
  ]
}