Send up to 50 messages over one SMTP connection

curl -X POST 'https://app.castomapi.com/v1/email/send' \
  -H 'x-api-key: <your-api-key>' \
  -H 'Content-Type: application/json' \
  -d '{"messages": [{"attachments": [{"content": "Hello from castomAPI.", "contentType": "application/pdf", "filename": "report.pdf"}], "bcc": [], "cc": [], "from": "ada@example.com", "html": "<h1>Hello</h1><p>From castomAPI.</p>", "subject": "Your September invoice", "text": "Hello from castomAPI.", "to": ["grace@example.com"]}], "server": {"host": "example.com", "password": "correct-horse-battery-staple", "port": 4, "secure": true, "username": "ada"}}'

const res = await fetch('https://app.castomapi.com/v1/email/send', {
  method: 'POST',
  headers: { 'x-api-key': '<your-api-key>', 'Content-Type': 'application/json' },
  body: JSON.stringify({"messages": [{"attachments": [{"content": "Hello from castomAPI.", "contentType": "application/pdf", "filename": "report.pdf"}], "bcc": [], "cc": [], "from": "ada@example.com", "html": "<h1>Hello</h1><p>From castomAPI.</p>", "subject": "Your September invoice", "text": "Hello from castomAPI.", "to": ["grace@example.com"]}], "server": {"host": "example.com", "password": "correct-horse-battery-staple", "port": 4, "secure": true, "username": "ada"}})
});
const data = await res.json();
console.log(data);

import { request } from 'node:https';

// Node 18+ has fetch built in
const res = await fetch('https://app.castomapi.com/v1/email/send', {
  method: 'POST',
  headers: { 'x-api-key': '<your-api-key>', 'Content-Type': 'application/json' },
  body: JSON.stringify({"messages": [{"attachments": [{"content": "Hello from castomAPI.", "contentType": "application/pdf", "filename": "report.pdf"}], "bcc": [], "cc": [], "from": "ada@example.com", "html": "<h1>Hello</h1><p>From castomAPI.</p>", "subject": "Your September invoice", "text": "Hello from castomAPI.", "to": ["grace@example.com"]}], "server": {"host": "example.com", "password": "correct-horse-battery-staple", "port": 4, "secure": true, "username": "ada"}})
});
const data = await res.json();
console.log(data);

import requests

res = requests.post(
    'https://app.castomapi.com/v1/email/send',
    headers={'x-api-key': '<your-api-key>'},
    json={"messages": [{"attachments": [{"content": "Hello from castomAPI.", "contentType": "application/pdf", "filename": "report.pdf"}], "bcc": [], "cc": [], "from": "ada@example.com", "html": "<h1>Hello</h1><p>From castomAPI.</p>", "subject": "Your September invoice", "text": "Hello from castomAPI.", "to": ["grace@example.com"]}], "server": {"host": "example.com", "password": "correct-horse-battery-staple", "port": 4, "secure": True, "username": "ada"}},
    timeout=30,
)
print(res.json())

<?php
$ch = curl_init('https://app.castomapi.com/v1/email/send');
curl_setopt_array($ch, [
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['x-api-key: <your-api-key>', 'Content-Type: application/json'],
    CURLOPT_POSTFIELDS => json_encode(['messages' => [['attachments' => [['content' => 'Hello from castomAPI.', 'contentType' => 'application/pdf', 'filename' => 'report.pdf']], 'bcc' => [], 'cc' => [], 'from' => 'ada@example.com', 'html' => '<h1>Hello</h1><p>From castomAPI.</p>', 'subject' => 'Your September invoice', 'text' => 'Hello from castomAPI.', 'to' => ['grace@example.com']]], 'server' => ['host' => 'example.com', 'password' => 'correct-horse-battery-staple', 'port' => 4, 'secure' => true, 'username' => 'ada']]),
]);
$data = json_decode(curl_exec($ch), true);
print_r($data);