SMTP Relay

const nodemailer = require('nodemailer');

const transporter = nodemailer.createTransport({
  host: 'mail.postkit.eu',
  port: 587,
  secure: false, // STARTTLS
  auth: {
    user: 'pk_live_abc123...',
    pass: 'pk_live_abc123...',
  },
});

await transporter.sendMail({
  from: 'you@yourdomain.com',
  to: 'user@example.com',
  subject: 'Hello from Postkit SMTP',
  html: '<h1>It works!</h1><p>Sent via SMTP relay.</p>',
});

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

msg = MIMEMultipart('alternative')
msg['Subject'] = 'Hello from Postkit SMTP'
msg['From'] = 'you@yourdomain.com'
msg['To'] = 'user@example.com'

text = MIMEText('Sent via SMTP relay.', 'plain')
html = MIMEText('<h1>It works!</h1><p>Sent via SMTP relay.</p>', 'html')
msg.attach(text)
msg.attach(html)

with smtplib.SMTP('mail.postkit.eu', 587) as server:
    server.starttls()
    server.login('pk_live_abc123...', 'pk_live_abc123...')
    server.send_message(msg)

use PHPMailer\PHPMailer\PHPMailer;

$mail = new PHPMailer(true);
$mail->isSMTP();
$mail->Host       = 'mail.postkit.eu';
$mail->SMTPAuth   = true;
$mail->Username   = 'pk_live_abc123...';
$mail->Password   = 'pk_live_abc123...';
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
$mail->Port       = 587;

$mail->setFrom('you@yourdomain.com', 'Your App');
$mail->addAddress('user@example.com');
$mail->Subject = 'Hello from Postkit SMTP';
$mail->isHTML(true);
$mail->Body = '<h1>It works!</h1><p>Sent via SMTP relay.</p>';

$mail->send();