A natural fit for your stack.

curl -X POST https://app.wazobiamail.com/api/v1/sending/messages   -H 'Content-Type: application/json'   -H "X-API-Key: $WAZOBIA_API_KEY"   -d '{
  "envelopeSender": "hello@yourbrand.com",
  "to": [
    "you@example.com"
  ],
  "content": {
    "from": "Your Brand <hello@yourbrand.com>",
    "subject": "Welcome to Your Brand",
    "htmlBody": "<p>Your account is ready. Welcome aboard!</p>"
  }
}'

// Node.js 18+ · run on your server
const response = await fetch('https://app.wazobiamail.com/api/v1/sending/messages', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-API-Key': process.env.WAZOBIA_API_KEY
  },
  body: JSON.stringify({
  "envelopeSender": "hello@yourbrand.com",
  "to": [
    "you@example.com"
  ],
  "content": {
    "from": "Your Brand <hello@yourbrand.com>",
    "subject": "Welcome to Your Brand",
    "htmlBody": "<p>Your account is ready. Welcome aboard!</p>"
  }
})
});
const result = await response.json();
if (!response.ok || result.success !== true) throw new Error(result.message || 'Send failed');
console.log(result);

// Node.js 18+ · run on your server
const key = process.env.WAZOBIA_API_KEY;
if (!key) throw new Error('Set WAZOBIA_API_KEY');
const message = {
  "envelopeSender": "hello@yourbrand.com",
  "to": [
    "you@example.com"
  ],
  "content": {
    "from": "Your Brand <hello@yourbrand.com>",
    "subject": "Welcome to Your Brand",
    "htmlBody": "<p>Your account is ready. Welcome aboard!</p>"
  }
};
const response = await fetch('https://app.wazobiamail.com/api/v1/sending/messages', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json', 'X-API-Key': key },
  body: JSON.stringify(message)
});
const result = await response.json();
if (!response.ok || result.success !== true) throw new Error(result.message || 'Send failed');
console.log(result);

<?php
// Requires the PHP cURL extension.
$key = getenv('WAZOBIA_API_KEY');
if (!$key) throw new RuntimeException('Set WAZOBIA_API_KEY');
$message = json_decode('{"envelopeSender":"hello@yourbrand.com","to":["you@example.com"],"content":{"from":"Your Brand <hello@yourbrand.com>","subject":"Welcome to Your Brand","htmlBody":"<p>Your account is ready. Welcome aboard!</p>"}}', true, 512, JSON_THROW_ON_ERROR);
$curl = curl_init('https://app.wazobiamail.com/api/v1/sending/messages');
curl_setopt_array($curl, [
  CURLOPT_POST => true, CURLOPT_RETURNTRANSFER => true,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTPHEADER => ['Content-Type: application/json', 'X-API-Key: ' . $key],
  CURLOPT_POSTFIELDS => json_encode($message, JSON_THROW_ON_ERROR)
]);
$body = curl_exec($curl);
if ($body === false) throw new RuntimeException(curl_error($curl));
$status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
curl_close($curl);
$result = json_decode($body, true, 512, JSON_THROW_ON_ERROR);
if ($status >= 300 || ($result['success'] ?? false) !== true) {
  throw new RuntimeException($result['message'] ?? 'Send failed');
}
print_r($result);

package main

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

func main() {
  key := os.Getenv("WAZOBIA_API_KEY")
  if key == "" { panic("Set WAZOBIA_API_KEY") }
  payload := []byte(`{
  "envelopeSender": "hello@yourbrand.com",
  "to": [
    "you@example.com"
  ],
  "content": {
    "from": "Your Brand <hello@yourbrand.com>",
    "subject": "Welcome to Your Brand",
    "htmlBody": "<p>Your account is ready. Welcome aboard!</p>"
  }
}`)
  req, err := http.NewRequest("POST", "https://app.wazobiamail.com/api/v1/sending/messages", bytes.NewReader(payload))
  if err != nil { panic(err) }
  req.Header.Set("Content-Type", "application/json")
  req.Header.Set("X-API-Key", key)
  client := &http.Client{Timeout: 30 * time.Second}
  res, err := client.Do(req)
  if err != nil { panic(err) }
  defer res.Body.Close()
  var result map[string]any
  if err := json.NewDecoder(res.Body).Decode(&result); err != nil { panic(err) }
  if res.StatusCode >= 300 || result["success"] != true { panic(fmt.Sprint(result)) }
  fmt.Println(result)
}

// Cargo.toml: reqwest = { version = "0.12", features = ["blocking", "json"] }
// serde_json = "1"
use reqwest::blocking::Client;
use serde_json::{json, Value};
use std::{env, time::Duration};

fn main() -> Result<(), Box<dyn std::error::Error>> {
  let key = env::var("WAZOBIA_API_KEY")?;
  let message = json!({
  "envelopeSender": "hello@yourbrand.com",
  "to": [
    "you@example.com"
  ],
  "content": {
    "from": "Your Brand <hello@yourbrand.com>",
    "subject": "Welcome to Your Brand",
    "htmlBody": "<p>Your account is ready. Welcome aboard!</p>"
  }
});
  let result: Value = Client::builder().timeout(Duration::from_secs(30)).build()?
    .post("https://app.wazobiamail.com/api/v1/sending/messages")
    .header("X-API-Key", key)
    .json(&message).send()?.error_for_status()?.json()?;
  if result["success"] != true { return Err(format!("Send failed: {result}").into()); }
  println!("{result}");
  Ok(())
}

# Python 3 · standard library only
import json
import os
import urllib.request

message = {
  "envelopeSender": "hello@yourbrand.com",
  "to": [
    "you@example.com"
  ],
  "content": {
    "from": "Your Brand <hello@yourbrand.com>",
    "subject": "Welcome to Your Brand",
    "htmlBody": "<p>Your account is ready. Welcome aboard!</p>"
  }
}
request = urllib.request.Request(
    'https://app.wazobiamail.com/api/v1/sending/messages',
    data=json.dumps(message).encode('utf-8'),
    headers={
        'Content-Type': 'application/json',
        'X-API-Key': os.environ['WAZOBIA_API_KEY'],
    },
    method='POST',
)
# HTTP errors raise urllib.error.HTTPError.
with urllib.request.urlopen(request, timeout=30) as response:
    result = json.load(response)
    if result.get('success') is not True:
        raise RuntimeError(result.get('message', 'Send failed'))
    print(result)

// .NET 6+ · run on your server
using System.Net.Http.Json;

var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key",
    Environment.GetEnvironmentVariable("WAZOBIA_API_KEY"));

var response = await client.PostAsJsonAsync(
    "https://app.wazobiamail.com/api/v1/sending/messages",
    new {
        envelopeSender = "hello@yourbrand.com",
        to = new[] { "you@example.com" },
        content = new {
            from = "Your Brand <hello@yourbrand.com>",
            subject = "Welcome to Your Brand",
            htmlBody = "<p>Your account is ready. Welcome aboard!</p>"
        }
    });

response.EnsureSuccessStatusCode();

// Java 11+ · run on your server
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

var json = """
    {
      "envelopeSender": "hello@yourbrand.com",
      "to": ["you@example.com"],
      "content": {
        "from": "Your Brand <hello@yourbrand.com>",
        "subject": "Welcome to Your Brand",
        "htmlBody": "<p>Your account is ready. Welcome aboard!</p>"
      }
    }""";

var request = HttpRequest.newBuilder()
    .uri(URI.create("https://app.wazobiamail.com/api/v1/sending/messages"))
    .header("Content-Type", "application/json")
    .header("X-API-Key", System.getenv("WAZOBIA_API_KEY"))
    .POST(HttpRequest.BodyPublishers.ofString(json))
    .build();

var response = HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString());
if (response.statusCode() / 100 != 2) throw new RuntimeException("Send failed: " + response.body());