php在centos上如何配置SMTP邮件发送

在CentOS上配置PHP以通过SMTP发送邮件，您需要完成以下步骤：

1. 安装并配置Postfix作为本地邮件传输代理（MTA）：

   a. 安装Postfix：

   sudo yum install postfix
   

   b. 配置Postfix：

   sudo vi /etc/postfix/main.cf
   

   在文件中添加以下内容：

   myhostname = mail.example.com
   mydomain = example.com
   myorigin = $mydomain
   inet_interfaces = all
   mydestination = $myhostname, localhost.$mydomain, $mydomain
   relayhost =
   inet_protocols = ipv4
   mynetworks = 127.0.0.0/8
   home_mailbox = Maildir/
   smtpd_sasl_auth_enable = yes
   smtpd_sasl_security_options = noanonymous
   smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
   smtpd_relay_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
   smtpd_tls_security_level = encrypt
   smtpd_tls_cert_file = /etc/pki/tls/certs/smtpd.crt
   smtpd_tls_key_file = /etc/pki/tls/private/smtpd.key
   smtpd_use_tls = yes
   smtp_tls_note_starttls_offer = yes
   smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
   smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
   

   c. 替换mail.example.com和example.com为您的实际域名。

   d. 重启Postfix服务：

   sudo systemctl restart postfix
   

2. 安装并配置PHPMailer：

   a. 使用Composer安装PHPMailer：

   composer require phpmailer/phpmailer
   

   b. 创建一个新的PHP文件（例如send_email.php），并添加以下代码：

   <?php
   use PHPMailer\PHPMailer\PHPMailer;
   use PHPMailer\PHPMailer\SMTP;
   use PHPMailer\PHPMailer\Exception;
   
   require 'vendor/autoload.php';
   
   $mail = new PHPMailer(true);
   
   try {
       // Server settings
       $mail->SMTPDebug = SMTP::DEBUG_SERVER;                      // Enable verbose debug output
       $mail->isSMTP();                                            // Send using SMTP
       $mail->Host       = 'mail.example.com';                     // Set the SMTP server to send through
       $mail->SMTPAuth   = true;                                   // Enable SMTP authentication
       $mail->AuthType   = SMTP::AUTH_LOGIN;                        // Use SMTP AUTH LOGIN
       $mail->Port       = 587;                                    // TCP port to connect to; use 587 if you have set `SMTP_TLS` above
       $mail->SMTPSecure = SMTP::ENCRYPTION_STARTTLS;            // Enable implicit TLS encryption
       $mail->Username   = 'your_email@example.com';               // SMTP username
       $mail->Password   = 'your_password';                        // SMTP password
   
       // Recipients
       $mail->setFrom('your_email@example.com', 'Mailer');
       $mail->addAddress('recipient@example.com', 'Recipient Name');     // Add a recipient
   
       // Content
       $mail->isHTML(true);                                        // Set email format to HTML
       $mail->Subject = 'Here is the subject';
       $mail->Body    = 'This is the HTML message body <b>in bold!</b>';
       $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';
   
       $mail->send();
       echo 'Message has been sent';
   } catch (Exception $e) {
       echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
   }
   

   c. 替换your_email@example.com、your_password和recipient@example.com为您的实际信息。

3. 运行PHP脚本发送邮件：

php send_email.php

如果一切配置正确，您应该能够通过SMTP发送邮件。