How does the SMTP protocol allow for sending emails without a local mail server in PHP?

To send emails without a local mail server in PHP, you can utilize the SMTP protocol to connect to a remote mail server and send the email through it. This allows you to send emails using an external mail server without the need for a local mail server setup. 

// Using PHPMailer library to send email via SMTP
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

// Include PHPMailer autoloader
require 'vendor/autoload.php';

// Instantiating PHPMailer
$mail = new PHPMailer(true);

try {
    // SMTP settings
    $mail->isSMTP();
    $mail->Host = 'smtp.example.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your_username';
    $mail->Password = 'your_password';
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
    $mail->Port = 587;

    // Email content
    $mail->setFrom('from@example.com', 'From Name');
    $mail->addAddress('to@example.com', 'To Name');
    $mail->Subject = 'Subject';
    $mail->Body = 'Email body';

    // Send email
    $mail->send();
    echo 'Email sent successfully';
} catch (Exception $e) {
    echo "Email could not be sent. Mailer Error: {$mail->ErrorInfo}";
}

Keywords

SMTP protocol sending emails local mail server PHP error types

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