PHP and PHPMAILER: How to implement automatic filtering of mail sending?

PHP and PHPMAILER: How to implement automatic filtering of mail sending?

In modern society, email has become one of the important ways for people to communicate. However, with the popularity and widespread use of email, the amount of spam has also shown an explosive growth trend. Spam emails not only waste users' time and network resources, but may also bring viruses and phishing behaviors. Therefore, when developing the email sending function, it becomes crucial to add the function of automatically filtering spam. This article will introduce how to use PHP and PHPMailer to implement the automatic filtering function of email sending.

1. PHP email sending
PHP is a scripting language that can be directly embedded in HTML. Through PHP, we can use the SMTP protocol to send emails to the specified mail server. PHP provides many functions and classes for sending emails, among which PHPMailer is the most commonly used and powerful one.

2. Introduction to PHPMailer
PHPMailer is an open source PHP email sending class. It provides a series of functions and methods to simplify the process of sending emails, and supports SMTP authentication, attachment sending and other functions.

3. Automatic spam filtering
In order to realize the automatic filtering function of email sending, we need to deal with it from two aspects: spam filtering rules and content filtering rules.

1. Spam filtering rules
   Spam filtering rules refer to using some algorithms or rules to determine whether an email is spam. Commonly used spam filtering rules include: keyword filtering, sender verification, IP address filtering, sender domain name check, etc.

The following is an example of PHP code using spam filtering rules:

function isSpam($subject, $sender) {
    $spamWords = array('广告', '抽奖', '免费');
    foreach ($spamWords as $word) {
        if (strpos($subject, $word) !== false || strpos($sender, $word) !== false) {
            return true; // 包含垃圾邮件关键词，判断为垃圾邮件
        }
    }
    return false; // 不包含垃圾邮件关键词，判断为正常邮件
}

Before the email is sent, we can determine whether the email is spam by calling the isSpam() function. If true is returned, do not send; if false is returned, send continues.

2. Content filtering rules
   Content filtering rules refer to filtering email content through some rules or regular expressions, such as: filtering words, filtering links, filtering attachment types, etc.

The following is an example of PHP code using content filtering rules:

function contentFilter($body) {
    $filterWords = array('违禁词1', '违禁词2', '违禁词3');
    foreach ($filterWords as $word) {
        $body = str_replace($word, '***', $body); // 将违禁词替换为***
    }
    return $body;
}

Before the email is sent, we can filter the email content by calling the contentFilter() function. Filtered content can be achieved by adding attachments, modifying the email body, etc.

4. PHPMailer Example
The following is a sample code that uses PHP and PHPMailer to send emails:

require 'PHPMailer/PHPMailerAutoload.php';
$mail = new PHPMailer;
$mail->isSMTP();
$mail->Host = 'smtp.qq.com';
$mail->SMTPAuth = true;
$mail->Username = 'your-email@qq.com';
$mail->Password = 'your-password';
$mail->SMTPSecure = 'tls';
$mail->Port = 587;
$mail->setFrom('your-email@qq.com', 'Your Name');
$mail->addAddress('recipient-email@example.com', 'Recipient Name');
$mail->isHTML(true);
$mail->Subject = 'Subject';
$mail->Body = '<p>Email Content</p>';
// 添加邮件过滤功能
if (!isSpam($mail->Subject, $mail->Username)) {
    $mail->Body = contentFilter($mail->Body);
    if(!$mail->send()) {
        echo '邮件发送失败: ' . $mail->ErrorInfo;
    } else {
        echo '邮件发送成功';
    }
} else {
    echo '邮件被判断为垃圾邮件，发送中止';
}

In this example, we first use the require statement to introduce the PHPMailer library file, Then create a PHPMailer object $mail and make the necessary settings. Finally, we call the isSpam() function and contentFilter() function to filter the mail. If the email passes the filtering rules, call the $mail->send() method to send the email, otherwise abort sending.

5. Summary
This article introduces how to use PHP and PHPMailer to implement the automatic filtering function of email sending. By setting spam filtering rules and content filtering rules, we can improve the efficiency and security of email sending. I hope this article can help you when developing email sending functions.

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