PEAR Mail SMTP发送邮件：正确配置CC和BCC收件人

<?php
require_once 'Mail.php';

// 假设这些变量已正确设置
$from = 'sender@example.com';
$to = 'main_recipient@example.com';
$cc = 'cc_recipient@example.com'; // 或 'cc1@example.com,cc2@example.com'
$bcc = 'bcc_recipient@example.com'; // 或 'bcc1@example.com,bcc2@example.com'
$subject = '测试邮件主题';
$message = '<h1>这是一封测试邮件</h1><p>内容详情。</p>';

$host = 'smtp.your-server.com';
$port = 587;
$username = 'your_smtp_username';
$password = 'your_smtp_password';

$headers = array (
    'From' => $from,
    'To' => $to,
    'Cc' => $cc,
    'Bcc' => $bcc, // 即使在此处设置，若不传给send()也无效
    'Subject' => $subject,
    'Reply-To' => $from,
    'X-Mailer' => 'PHP/' . phpversion(),
    'MIME-Version' => '1.0',
    'Content-Type' => 'text/html; charset=UTF-8' // 建议使用UTF-8
);

$smtp = Mail::factory('smtp', array (
    'host' => $host,
    'port' => $port,
    'auth' => true,
    'username' => $username,
    'password' => $password
));

// 错误：此处只传入了 $to，导致 $cc 和 $bcc 收件人未被SMTP服务器识别
$result = $smtp->send($to, $headers, $message);

if (PEAR::isError($result)) {
    echo "邮件发送失败: " . $result->getMessage();
} else {
    echo "邮件发送成功！";
}
?>

<?php
require_once 'Mail.php';
require_once 'Mail/mime.php'; // 推荐使用Mail_mime处理邮件内容和头部

// 假设这些变量已正确设置
$from = 'sender@example.com';
$to_address = 'main_recipient@example.com';
$cc_address = 'cc_recipient@example.com,another_cc@example.com';
$bcc_address = 'bcc_recipient@example.com'; // 多个用逗号分隔
$subject = '正确配置CC和BCC的测试邮件';
$text_body = '这是一封使用PEAR Mail正确发送CC和BCC的测试邮件。';
$html_body = '<h1>这是一封使用PEAR Mail正确发送CC和BCC的测试邮件</h1><p>请确保所有收件人都能收到。</p>';

$host = 'smtp.your-server.com';
$port = 587;
$username = 'your_smtp_username';
$password = 'your_smtp_password';

// 步骤 1: 合并所有收件人地址作为SMTP的实际接收者
// 注意：BCC地址通常不包含在邮件头部中，但在SMTP传输时必须包含在recipients列表中
$recipients = $to_address;
if (!empty($cc_address)) {
    $recipients .= ',' . $cc_address;
}
if (!empty($bcc_address)) {
    $recipients .= ',' . $bcc_address;
}

// 步骤 2: 配置邮件头部，其中Bcc通常不包含在headers中以保持密送特性
$headers = array (
    'From' => $from,
    'To' => $to_address,
    'Cc' => $cc_address, // Cc地址需要在头部中明确列出
    'Subject' => $subject,
    'Reply-To' => $from,
    'X-Mailer' => 'PHP/' . phpversion(),
);

// 使用Mail_mime类构建邮件，以更好地处理多部分内容和编码
$mime = new Mail_mime(array('eol' => "\n"));
$mime->setTXTBody($text_body);
$mime->setHTMLBody($html_body);
$body = $mime->get();
$headers = $mime->headers($headers); // Mail_mime会处理Content-Type等头部

$smtp = Mail::factory('smtp', array (
    'host' => $host,
    'port' => $port,
    'auth' => true,
    'username' => $username,
    'password' => $password
));

// 关键点：将所有收件人字符串传递给send()方法的第一个参数
$result = $smtp->send($recipients, $headers, $body);

if (PEAR::isError($result)) {
    echo "邮件发送失败: " . $result->getMessage() . "\n";
    // 调试信息
    // echo "Debug Info: " . print_r($smtp->debug, true);
} else {
    echo "邮件发送成功！\n";
}
?>