const nodemailer = require('nodemailer');

const transporter = nodemailer.createTransport({
    host: 'smtp.yourservice.com',
    port: 587,
    secure: false, // Use STARTTLS
    auth: {
        user: 'YOUR_USERNAME',
        pass: 'YOUR_PASSWORD'
    }
});

await transporter.sendMail({
    from: 'sender@example.com',
    to: 'recipient@example.com',
    subject: 'Hello from SMTP Servers',
    text: 'This is a test email!',
    html: '<h1>Hello!</h1><p>This is a test email.</p>'
});

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

msg = MIMEMultipart('alternative')
msg['Subject'] = 'Hello from SMTP Servers'
msg['From'] = 'sender@example.com'
msg['To'] = 'recipient@example.com'

text = 'This is a test email!'
html = '<h1>Hello!</h1><p>This is a test email.</p>'

msg.attach(MIMEText(text, 'plain'))
msg.attach(MIMEText(html, 'html'))

with smtplib.SMTP('smtp.yourservice.com', 587) as server:
    server.starttls()
    server.login('YOUR_USERNAME', 'YOUR_PASSWORD')
    server.send_message(msg)

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;

$mail = new PHPMailer(true);

$mail->isSMTP();
$mail->Host       = 'smtp.yourservice.com';
$mail->SMTPAuth   = true;
$mail->Username   = 'YOUR_USERNAME';
$mail->Password   = 'YOUR_PASSWORD';
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
$mail->Port       = 587;

$mail->setFrom('sender@example.com', 'Sender Name');
$mail->addAddress('recipient@example.com', 'Recipient Name');

$mail->isHTML(true);
$mail->Subject = 'Hello from SMTP Servers';
$mail->Body    = '<h1>Hello!</h1><p>This is a test email.</p>';
$mail->AltBody = 'This is a test email!';

$mail->send();