SMTP Relay

Host:     smtp.xmit.sh
Port:     587
Username: api
Password: YOUR_API_KEY
Security: STARTTLS

const nodemailer = require('nodemailer');

const transporter = nodemailer.createTransport({
  host: 'smtp.xmit.sh',
  port: 587,
  secure: false, // STARTTLS
  auth: {
    user: 'api',
    pass: 'pm_live_xxxxx'
  }
});

await transporter.sendMail({
  from: 'hello@yourapp.com',
  to: 'user@example.com',
  subject: 'Welcome!',
  html: '<h1>Welcome!</h1>'
});

import smtplib
from email.mime.text import MIMEText

msg = MIMEText('<h1>Welcome!</h1>', 'html')
msg['Subject'] = 'Welcome!'
msg['From'] = 'hello@yourapp.com'
msg['To'] = 'user@example.com'

with smtplib.SMTP('smtp.xmit.sh', 587) as server:
    server.starttls()
    server.login('api', 'pm_live_xxxxx')
    server.send_message(msg)

use PHPMailer\PHPMailer\PHPMailer;

$mail = new PHPMailer(true);
$mail->isSMTP();
$mail->Host = 'smtp.xmit.sh';
$mail->Port = 587;
$mail->SMTPAuth = true;
$mail->Username = 'api';
$mail->Password = 'pm_live_xxxxx';
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;

$mail->setFrom('hello@yourapp.com');
$mail->addAddress('user@example.com');
$mail->Subject = 'Welcome!';
$mail->Body = '<h1>Welcome!</h1>';
$mail->send();

{
  "smtp_hostname": "smtp.xmit.sh",
  "smtp_port": 587,
  "mail_options": {
    "secure": false,
    "auth": {
      "user": "api",
      "pass": "pm_live_xxxxx"
    }
  }
}

swaks --to user@example.com \
      --from hello@yourapp.com \
      --server smtp.xmit.sh:587 \
      --auth LOGIN \
      --auth-user api \
      --auth-password pm_live_xxxxx \
      --tls \
      --body "Hello from SMTP!"