教學目的主要有兩個
– 讓用家掌握使用終端(Terminal)及Composer的流程
-了解SMTP設定

為何需要phpmailer發送電郵?

近年垃圾電郵問題越趨嚴重，相對的主要電郵服務商如Yahoo跟Google一直在提高一些返垃圾電郵(Anti-spam)的要求。這個情況下單純使用php sendmail發送電郵很容易會被錯誤辨識為垃圾郵件，又或者需要複雜的Email Header設定才能達到成功送達效果，而phpmailer就是其中一個簡單的解決方案。

1. 首先登入Directadmin網上控制台，進入”系統資訊和檔案” > “終端”。
   
   
2. 先進入public_html 資料夾(假設php script需要公開)，然後輸入安裝指令
   
   composer require phpmailer/phpmailer
   
   
   
   
3. 安裝完成後，可以參考以下示範
   (源始碼來自 https://github.com/PHPMailer/PHPMailer )
   
4. 特別留意源始碼的登入設定，包括
   
   $mail->Host = ‘mail.floppy-demo.com’;
   如果使用Gmail發送電郵，主機名稱應該是smtp.gmail.com
   
   $mail->Username = ‘[email protected]’;
   $mail->Password = ‘PASSWORD’;
   如果使用Gmail發送電郵，電郵密碼應該是App Password，不懂如果取得可參考這個教學。　
   

<?php
//Import PHPMailer classes into the global namespace
//These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

//Load Composer's autoloader
require 'vendor/autoload.php';

//Create an instance; passing `true` enables exceptions
$mail = new PHPMailer(true);

try {
    //Server settings
    $mail->SMTPDebug = SMTP::DEBUG_SERVER;                      //Enable verbose debug output
    $mail->isSMTP();                                            //Send using SMTP
    $mail->Host       = 'mail.floppy-demo.com';                     //Set the SMTP server to send through
    $mail->SMTPAuth   = true;                                   //Enable SMTP authentication
    $mail->Username   = '[email protected]';                     //SMTP username
    $mail->Password   = 'PASSWORD';                               //SMTP password
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;            //Enable implicit TLS encryption
    $mail->Port       = 465;                                    //TCP port to connect to; use 587 if you have set `SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS`

    //Recipients
    $mail->setFrom('[email protected]', '寄件者名稱');
    $mail->addAddress('[email protected]', '收件者名稱');     //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}";
}