PHP를 사용하여 SMTP 프로토콜 기반 이메일 통신을 구현하는 방법

composer require phpmailer/phpmailer

require 'path/to/phpmailer/src/PHPMailer.php';
require 'path/to/phpmailer/src/SMTP.php';

use PHPMailerPHPMailerPHPMailer;
use PHPMailerPHPMailerException;

$mail = new PHPMailer(true);
$mail->SMTPDebug = 2;                                 // 调试模式，设为2可以获取详细的调试信息
$mail->isSMTP();                                      // 使用SMTP协议
$mail->Host = 'smtp.example.com';                     // SMTP服务器地址
$mail->Port = 25;                                     // SMTP服务器端口号
$mail->SMTPAuth = true;                               // 开启SMTP身份验证
$mail->Username = 'your-email@example.com';           // SMTP用户名
$mail->Password = 'your-password';                    // SMTP密码
$mail->SMTPSecure = 'tls';                            // 使用TLS加密，可选'ssl'
$mail->setFrom('your-email@example.com', 'Your Name');// 发件人邮箱和名称

$mail->addAddress('recipient@example.com', 'Recipient Name'); // 添加收件人邮箱和名称
$mail->Subject = 'Hello World';                                // 设置邮件主题
$mail->Body = 'This is the content of the email.';             // 设置邮件正文内容

if($mail->send()) {
    echo 'Email sent successfully!';
} else {
    echo 'Failed to send email: ' . $mail->ErrorInfo;
}

SMTPDebug = 2;
$mail->isSMTP();
$mail->Host = 'smtp.example.com';
$mail->Port = 25;
$mail->SMTPAuth = true;
$mail->Username = 'your-email@example.com';
$mail->Password = 'your-password';
$mail->SMTPSecure = 'tls';
$mail->setFrom('your-email@example.com', 'Your Name');
$mail->addAddress('recipient@example.com', 'Recipient Name');
$mail->Subject = 'Hello World';
$mail->Body = 'This is the content of the email.';

if($mail->send()) {
    echo 'Email sent successfully!';
} else {
    echo 'Failed to send email: ' . $mail->ErrorInfo;
}