SendGrid SMTP Settings (2026)

// Using PHPMailer: 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 {
    // SendGrid SMTP settings
    $mail->isSMTP();
    $mail->Host       = 'smtp.sendgrid.net';
    $mail->SMTPAuth   = true;
    $mail->Username   = 'apikey';  // Always 'apikey'
    $mail->Password   = getenv('SENDGRID_API_KEY');
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
    $mail->Port       = 587;

    // Sender & recipient
    $mail->setFrom('sender@yourdomain.com', 'Your Name');
    $mail->addAddress('recipient@example.com');

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

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

// npm install nodemailer dotenv
const nodemailer = require('nodemailer');
require('dotenv').config();

// Create transporter with SendGrid SMTP
const transporter = nodemailer.createTransport({
    host: 'smtp.sendgrid.net',
    port: 587,
    secure: false, // true for 465, false for 587
    auth: {
        user: 'apikey', // Always 'apikey'
        pass: process.env.SENDGRID_API_KEY
    }
});

async function sendEmail() {
    try {
        const info = await transporter.sendMail({
            from: '"Your Name" <sender@yourdomain.com>',
            to: 'recipient@example.com',
            subject: 'Hello from SendGrid',
            html: '<h1>Welcome!</h1><p>This is a test email.</p>',
            // Optional: Add categories for analytics
            headers: {
                'X-SMTPAPI': JSON.stringify({
                    category: ['transactional', 'welcome']
                })
            }
        });

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

sendEmail();

# gem install mail
require 'mail'

# Configure SendGrid SMTP
Mail.defaults do
  delivery_method :smtp, {
    address:              'smtp.sendgrid.net',
    port:                 587,
    user_name:            'apikey',  # Always 'apikey'
    password:             ENV['SENDGRID_API_KEY'],
    authentication:       :plain,
    enable_starttls_auto: true
  }
end

# Send email
mail = Mail.new do
  from    'sender@yourdomain.com'
  to      'recipient@example.com'
  subject 'Hello from SendGrid'

  html_part do
    content_type 'text/html; charset=UTF-8'
    body '<h1>Welcome!</h1><p>This is a test email.</p>'
  end
end

mail.deliver!
puts 'Email sent successfully!'

// go get gopkg.in/gomail.v2
package main

import (
    "os"
    "gopkg.in/gomail.v2"
)

func main() {
    // SendGrid SMTP configuration
    smtpServer := "smtp.sendgrid.net"
    smtpPort := 587
    smtpUser := "apikey"  // Always "apikey"
    smtpPass := os.Getenv("SENDGRID_API_KEY")

    // Create message
    m := gomail.NewMessage()
    m.SetHeader("From", "sender@yourdomain.com")
    m.SetHeader("To", "recipient@example.com")
    m.SetHeader("Subject", "Hello from SendGrid")
    m.SetBody("text/html", "<h1>Welcome!</h1><p>This is a test email.</p>")

    // Optional: Add categories
    m.SetHeader("X-SMTPAPI", `{"category": ["transactional"]}`)

    // Send
    d := gomail.NewDialer(smtpServer, smtpPort, smtpUser, smtpPass)

    if err := d.DialAndSend(m); err != nil {
        panic(err)
    }
}