Gmail SMTP Settings (2026)

// PHP - Gmail SMTP with PHPMailer
// Install: composer require phpmailer/phpmailer

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    // Server settings
    $mail->isSMTP();
    $mail->Host       = 'smtp.gmail.com';
    $mail->SMTPAuth   = true;
    $mail->Username   = 'your.email@gmail.com';
    $mail->Password   = 'xxxx xxxx xxxx xxxx'; // App Password
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
    $mail->Port       = 587;

    // Recipients
    $mail->setFrom('your.email@gmail.com', 'Your Name');
    $mail->addAddress('recipient@example.com');

    // Content
    $mail->isHTML(true);
    $mail->Subject = 'Test Subject';
    $mail->Body    = 'Hello from Gmail SMTP!';

    $mail->send();
    echo 'Email sent successfully!';
} catch (Exception $e) {
    echo "Error: {$mail->ErrorInfo}";
}

// Node.js - Gmail SMTP with Nodemailer
// Install: npm install nodemailer

const nodemailer = require('nodemailer');

// Create transporter
const transporter = nodemailer.createTransport({
    host: 'smtp.gmail.com',
    port: 587,
    secure: false, // true for 465, false for 587
    auth: {
        user: 'your.email@gmail.com',
        pass: 'xxxx xxxx xxxx xxxx' // App Password
    }
});

// Send email
async function sendEmail() {
    try {
        const info = await transporter.sendMail({
            from: '"Your Name" <your.email@gmail.com>',
            to: 'recipient@example.com',
            subject: 'Test Subject',
            text: 'Hello from Gmail SMTP!',
            html: '<b>Hello from Gmail SMTP!</b>'
        });

        console.log('Email sent:', info.messageId);
    } catch (error) {
        console.error('Error:', error);
    }
}

sendEmail();

// C# - Gmail SMTP with System.Net.Mail
using System.Net;
using System.Net.Mail;

public class GmailSender
{
    public static void SendEmail(string toEmail, string subject, string body)
    {
        var smtpClient = new SmtpClient("smtp.gmail.com")
        {
            Port = 587,
            Credentials = new NetworkCredential(
                "your.email@gmail.com",
                "xxxx xxxx xxxx xxxx" // App Password
            ),
            EnableSsl = true,
        };

        var mailMessage = new MailMessage
        {
            From = new MailAddress("your.email@gmail.com"),
            Subject = subject,
            Body = body,
            IsBodyHtml = true,
        };
        mailMessage.To.Add(toEmail);

        try
        {
            smtpClient.Send(mailMessage);
            Console.WriteLine("Email sent successfully!");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
        }
    }
}

# Postfix - Gmail SMTP Relay Configuration
# Edit /etc/postfix/main.cf

# SMTP Relay Host
relayhost = [smtp.gmail.com]:587

# Enable SASL authentication
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

# TLS Configuration
smtp_tls_security_level = encrypt
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

# Create /etc/postfix/sasl_passwd:
[smtp.gmail.com]:587 your.email@gmail.com:xxxx-xxxx-xxxx-xxxx

# Then run:
# sudo postmap /etc/postfix/sasl_passwd
# sudo chmod 600 /etc/postfix/sasl_passwd*
# sudo systemctl restart postfix