我尝试在我的快速时间，我有同样的问题，但经过适当的研究，我解决了它。以下是我的方法。您必须下载PHPMailer源文件，并在项目中手动包含所需的文件。

您可以从PHPMailer主页1下载带有源代码的ZIP文件，点击“克隆或下载”绿色按钮(在右侧)，然后选择“下载ZIP”。在要保存源文件的目录中解压缩包。

1来自:GitHub。 第二步:打开“(来自Gmail地址)谷歌帐户”，执行以下步骤:

禁用谷歌帐号的双因素密码验证。

Turn on Less Security. Allow third party app. There you Go.. <?php use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\Exception; require 'PHPMailer/src/Exception.php'; require 'PHPMailer/src/PHPMailer.php'; require 'PHPMailer/src/SMTP.php'; session_start(); if (isset($_POST['send'])) { $email = $_POST['email']; $subject = $_POST['subject']; $message = "I am trying"; //Load composer's autoloader $mail = new PHPMailer(true); try { //Server settings $mail->isSMTP(); $mail->Host = 'smtp.gmail.com'; $mail->SMTPAuth = true; $mail->Username = 'youremail@gmail.com'; $mail->Password = 'password'; $mail->SMTPOptions = array( 'ssl' => array( 'verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true ) ); $mail->SMTPSecure = 'ssl'; $mail->Port = 465; //Send Email $mail->setFrom('youremail@gmail.com'); //Recipients $mail->addAddress($email); $mail->addReplyTo('youremail@gmail.com'); //Content $mail->isHTML(true); $mail->Subject = $subject; $mail->Body = $message; $mail->send(); $_SESSION['result'] = 'Message has been sent'; $_SESSION['status'] = 'ok'; } catch (Exception $e) { $_SESSION['result'] = 'Message could not be sent. Mailer Error: ' . $mail->ErrorInfo; $_SESSION['status'] = 'error'; echo 'Message could not be sent. Mailer Error: ' . $mail->ErrorInfo; } } header("location: forgotPassword.php");

对于未来的读者:如果其他答案都不管用(就像我的情况一样)，试试这个:

1)。下载PHPMailer，打开zip文件并解压到您的项目目录。

3)。将提取的目录重命名为phpailer，并在php脚本中编写以下代码(脚本必须在phpailer文件夹之外)

<?php
// PHPMailer classes into the global namespace
use PHPMailer\PHPMailer\PHPMailer; 
use PHPMailer\PHPMailer\Exception;
// Base files 
require 'PHPMailer/src/Exception.php';
require 'PHPMailer/src/PHPMailer.php';
require 'PHPMailer/src/SMTP.php';
// create object of PHPMailer class with boolean parameter which sets/unsets exception.
$mail = new PHPMailer(true);                              
try {
    $mail->isSMTP(); // using SMTP protocol                                     
    $mail->Host = 'smtp.gmail.com'; // SMTP host as gmail 
    $mail->SMTPAuth = true;  // enable smtp authentication                             
    $mail->Username = 'sender@gmail.com';  // sender gmail host              
    $mail->Password = 'password'; // sender gmail host password                          
    $mail->SMTPSecure = 'tls';  // for encrypted connection                           
    $mail->Port = 587;   // port for SMTP     

    $mail->setFrom('sender@gmail.com', "Sender"); // sender's email and name
    $mail->addAddress('receiver@gmail.com', "Receiver");  // receiver's email and name

    $mail->Subject = 'Test subject';
    $mail->Body    = 'Test body';

    $mail->send();
    echo 'Message has been sent';
} catch (Exception $e) { // handle error.
    echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}
?>

你可以做一个测试，如果你需要它通过修补如下代码

# SSH into droplet
# go to project
$ php artisan tinker
$ Mail::send('errors.401', [], function ($message) { $message->to('emmanuelbarturen@gmail.com')->subject('this works!'); });
# check your mailbox

使用PHPMailer通过邮件发送用户密码的步骤:

步骤1:首先，从GitHub下载PHPMailer软件包

您只需下载PHPMailer源文件并手动包含所需的文件。

您可以从PHPMailer主页[1]下载带有源代码的ZIP文件， 点击“克隆或下载”绿色按钮(右侧)，然后选择“下载ZIP”。 在要保存源文件的目录中解压缩包。

[1] https://github.com/PHPMailer/PHPMailer

第二步:打开“(来自Gmail地址)谷歌帐户”，执行以下步骤:

禁用谷歌帐号的双因素密码验证。 打开Less Security。 允许第三方应用程序。

步骤3:尝试使用下面的代码(注意:在这里，我只提供了使用PHP和MySQL通过电子邮件发送用户密码的功能代码)

    <?php 
    session_start();

    use PHPMailer\PHPMailer\PHPMailer;  //add use in starting of the code

    $db = mysqli_connect('localhost', 'root', '', '[Enter your Database Name]'); // connect to database

    if (isset($_POST['forgot_btn'])) {
        forgotpassword();
    }

    function forgotpassword(){
    global $db;
     
        $user_id = $_POST['user_id'];
        $result = mysqli_query($db,"SELECT * FROM users where user_id='$user_id'");
        $row = mysqli_fetch_assoc($result);
        $fetch_user_id=$row['user_id'];
        $name=$row['name'];
        $email_id=$row['email_id'];
        $password=$row['password'];
        if($user_id==$fetch_user_id) {
       require '../PHPMailer/vendor/autoload.php';  //Please correctly mention the PHPMailer installed directory (Don't follow my directory)

    $mail = new PHPMailer(TRUE);
    try{
       $mail->setFrom('[Enter your From Email_Address]', '[Enter Sender Name]');
       $mail->addAddress($email_id, $name);  //[To Email Address and Name]
       $mail->Subject = 'Regarding Forgot Password';
       $mail->Body = 'Hi '.$name.',Your Login Password is:'.$password.'';
       $mail->isSMTP();
       $mail->Host = 'smtp.gmail.com';
       $mail->SMTPAuth = TRUE;
       $mail->SMTPSecure = 'tls';
       $mail->Username = '[Enter your From Email_Address]';
       $mail->Password = '[Enter your From Email_Address -> Password]';
       $mail->Port = 587;
       
       if($mail->send())
       {
          echo "<script>alert('Password Sent Successfully');</script>"; 
       }
       else
       {
         echo "<script>alert('Please Check Your Internet Connection or From Email Address/Password or Wrong To Email Address');</script>";   
       }
    }
    catch (Exception $e)
    {
       echo "<script>alert('Please Check Your Internet Connection or From Email Address/Password or Wrong To Email Address');</script>";
    }
        }
    }

    ?>

更多信息请参考这些文档[1]:

[1]. https://alexwebdevelop.com/phpmailer-tutorial/

还可以查看PEAR邮件包PEAR mail Page

它似乎比内置的标准mail()函数健壮一些(如果标准函数不够的话)。

下面是该页面的一段摘录，展示如何使用它。PEAR邮件发送()用法

<?php
    include('Mail.php');

    $recipients = 'joe@example.com';

    $headers['From']    = 'richard@example.com';
    $headers['To']      = 'joe@example.com';
    $headers['Subject'] = 'Test message';

    $body = 'Test message';

    $smtpinfo["host"] = "smtp.server.com";
    $smtpinfo["port"] = "25";
    $smtpinfo["auth"] = true;
    $smtpinfo["username"] = "smtp_user";
    $smtpinfo["password"] = "smtp_password";


    // Create the mail object using the Mail::factory method
    $mail_object =& Mail::factory("smtp", $smtpinfo); 

    $mail_object->send($recipients, $headers, $body);
?> 

原生PHP函数mail()不适合我。它发出消息:

此邮件服务器在试图发送时需要身份验证 到非本地电子邮件地址

所以，我通常使用PHPMailer包

我已经从GitHub下载了5.2.23版本。

我只选择了2个文件，并将它们放在我的源代码PHP根目录中

class.phpmailer.php class.smtp.php

在PHP中，需要添加该文件

require_once('class.smtp.php');
require_once('class.phpmailer.php');

在此之后，它只是代码:

require_once('class.smtp.php');
require_once('class.phpmailer.php');
... 
//----------------------------------------------
// Send an e-mail. Returns true if successful 
//
//   $to - destination
//   $nameto - destination name
//   $subject - e-mail subject
//   $message - HTML e-mail body
//   altmess - text alternative for HTML.
//----------------------------------------------
function sendmail($to,$nameto,$subject,$message,$altmess)  {

  $from  = "yourcontact@yourdomain.com";
  $namefrom = "yourname";
  $mail = new PHPMailer();  
  $mail->CharSet = 'UTF-8';
  $mail->isSMTP();   // by SMTP
  $mail->SMTPAuth   = true;   // user and password
  $mail->Host       = "localhost";
  $mail->Port       = 25;
  $mail->Username   = $from;  
  $mail->Password   = "yourpassword";
  $mail->SMTPSecure = "";    // options: 'ssl', 'tls' , ''  
  $mail->setFrom($from,$namefrom);   // From (origin)
  $mail->addCC($from,$namefrom);      // There is also addBCC
  $mail->Subject  = $subject;
  $mail->AltBody  = $altmess;
  $mail->Body = $message;
  $mail->isHTML();   // Set HTML type
//$mail->addAttachment("attachment");  
  $mail->addAddress($to, $nameto);
  return $mail->send();
}

这招很管用