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Sending examples

Below, I'll walk you through examples of sending emails using the specified configuration:

  • Hostname:
  • Port: 465
  • Encryption: Regular TLS
  • Username: "user"
  • Password: "some-long-secure-token"

In this example, I'll utilize PHPMailer to dispatch a transactional welcome email.

use PHPMailer\PHPMailer\PHPMailer;
require 'path/to/composer/vendor/autoload.php';

$mail->Host = '';
$mail->SMTPAuth = true;
$mail->Username = 'user';
$mail->Password = 'some-long-secure-token';
$mail->SMTPSecure = 'ssl';
$mail->Port = 465;

$mail->setFrom('', 'My Awesome SaaS');
$mail->addReplyTo('', 'John Doe');
$mail->Subject = "Welcome!";
$mail->Body = '<p>Welcome to our awesome SaaS service!</p>';
$mail->AltBody = 'Welcome to our awesome SaaS service!';


It's important to note that the SMTPSecure option is set to ssl. We've discussed the reasoning behind this choice earlier here.

Key Considerations

  • Reusing SMTP Connection: One might wonder if it's beneficial to reuse the SMTP connection to send multiple emails over the same TLS connection. While it's technically feasible, it introduces unnecessary complexity without significant advantages.

  • Queueing System: Instead of reusing connections, it's more efficient to implement a robust queueing system. This ensures that you don't inundate the SMTP server with too many simultaneous connections. Ideally, each email should be sent over its own dedicated connection.

  • Connection Speed: The process of setting up TCP and TLS is typically swift, meaning the time taken to establish these connections is negligible in most scenarios.

  • Optimization: Only consider advanced optimization strategies, such as reusing SMTP connections, if you encounter genuine issues. This might be relevant if you're dealing with an unstable network or if you're sending an exceptionally large volume of emails in a brief timeframe.

Remember, the key is to maintain a balance between efficiency and simplicity. Overcomplicating the process can lead to more challenges down the line.