步驟1、先下載phpmailer放到vendor目錄，如下圖

步驟2、在公共函數文件common.php中加入以下代碼：

function send_email($to,$subject=‘‘,$content=‘‘){
    vendor(‘phpmailer.PHPMailerAutoload‘); ////require_once vendor/phpmailer/PHPMailerAutoload.php‘;
    $mail = new PHPMailer;

    $mail->CharSet  = ‘UTF-8‘; //設定郵件編碼，默認ISO-8859-1，如果發中文此項必須設置，否則亂碼
    $mail->isSMTP();
    //Enable SMTP debugging
    // 0 = off (for production use)
    // 1 = client messages
    // 2 = client and server messages
    $mail->SMTPDebug = 0;
    //調試輸出格式
    //$mail->Debugoutput = ‘html‘;
    //smtp服務器
    $mail->Host = config(‘email.smtp_server‘);
    //端口 - likely to be 25, 465 or 587
    $mail->Port = 465;
    if($mail->Port === 465) $mail->SMTPSecure = ‘ssl‘;// 使用安全協議
    //Whether to use SMTP authentication
    $mail->SMTPAuth = true;
    //發送郵箱
    $mail->Username = config(‘email.smtp_user‘);
    //密碼
    $mail->Password = config(‘email.smtp_pwd‘);
    //Set who the message is to be sent from
    $mail->setFrom(config(‘email.smtp_user‘),‘尊敬的用戶‘);
    //回復地址
    //$mail->addReplyTo(‘[email protected]‘, ‘First Last‘);
    //接收郵件方
    if(is_array($to)){
        foreach ($to as $v){
            $mail->addAddress($v);
        }
    }else{
        $mail->addAddress($to);
    }

    $mail->isHTML(true);// send as HTML
    //標題
    $mail->Subject = $subject;
    //HTML內容轉換
    $mail->msgHTML($content);
    //Replace the plain text body with one created manually
    //$mail->AltBody = ‘This is a plain-text message body‘;
    //添加附件
    //$mail->addAttachment(‘images/phpmailer_mini.png‘);
    //send the message, check for errors
    return $mail->Send();
}

　步驟3、在config.php中增加以下代碼：

//email
    ‘email‘  => [
        ‘smtp_server‘   => ‘郵箱服務地址‘,
        ‘smtp_port‘     => ‘端口號‘,
        ‘smtp_user‘     => ‘用戶名‘,
        ‘smtp_pwd‘      => ‘密碼‘,
    ],

　　步驟4、調用

send_email($to, $title, $content);
//$to  要發送的地址
//$title 郵件標題
//$content　郵件內容

thinkphp5中如何正確使用phpmailer發送郵件