PHPMailer 错误：无法实例化邮件程序功能答案

【问题标题】：PHPMailer error: could not instantiate mailer functionPHPMailer 错误：无法实例化邮件程序功能
【发布时间】：2019-07-24 09:31:44
【问题描述】：

我正在使用 PHPMailer 从我的本地主机发送邮件，我正在使用 XAMPP 服务器和 sendgrid SMTP 服务器。问题是有时，邮件发送成功，有时它给我错误：无法实例化邮件功能。

假设我想发送 5 封邮件，它可能最终只发送 2 封，而另外 3 封将给出错误：无法实例化邮件功能。

有人知道是什么原因造成的吗？？

这是我的 sendmail.ini 配置文件

; configuration for fake sendmail

; if this file doesn't exist, sendmail.exe will look for the settings in
; the registry, under HKLM\Software\Sendmail

[sendmail]

; you must change mail.mydomain.com to your smtp server,
; or to IIS's "pickup" directory.  (generally C:\Inetpub\mailroot\Pickup)
; emails delivered via IIS's pickup directory cause sendmail to
; run quicker, but you won't get error messages back to the calling
; application.

smtp_server=smtp.sendgrid.net

; smtp port (normally 25)

smtp_port=25

; SMTPS (SSL) support
;   auto = use SSL for port 465, otherwise try to use TLS
;   ssl  = alway use SSL
;   tls  = always use TLS
;   none = never try to use SSL

smtp_ssl=auto

; the default domain for this server will be read from the registry
; this will be appended to email addresses when one isn't provided
; if you want to override the value in the registry, uncomment and modify

;default_domain=mydomain.com

; log smtp errors to error.log (defaults to same directory as  sendmail.exe)
; uncomment to enable logging

error_logfile=error.log

; create debug log as debug.log (defaults to same directory as sendmail.exe)
; uncomment to enable debugging

;debug_logfile=debug.log

; if your smtp server requires authentication, modify the following two lines

auth_username=apikey
auth_password=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

; if your smtp server uses pop3 before smtp authentication, modify the 
; following three lines.  do not enable unless it is required.

pop3_server=
pop3_username=
pop3_password=

; force the sender to always be the following email address
; this will only affect the "MAIL FROM" command, it won't modify 
; the "From: " header of the message content

;force_sender=

; force the sender to always be the following email address
; this will only affect the "RCTP TO" command, it won't modify 
; the "To: " header of the message content

;force_recipient=

; sendmail will use your hostname and your default_domain in the ehlo/helo
; smtp greeting.  you can manually set the ehlo/helo name if required

hostname=

这是php代码

    $mail = new PHPMailer();
    $mail->From = $_SESSION['from'];
    $mail->FromName = $_SESSION['from-name'];
    if ( isset($_SESSION['reply-email']) && isset($_SESSION['reply-name']) ){

        $mail->addReplyTo($_SESSION['reply-email'], $_SESSION['reply-name']);
    }
    $mail->addAddress($_POST['email']);
    $mail->isHTML(true);
    $mail->Subject = $_SESSION['subject'];
    $mail->Body = $_SESSION['message'];

    //try sending the mail
    if ( $mail->send() ){
        $msg = array("status" => 1, "msg" => "sent", "email" => $email, "index" => $index);
        exit( json_encode( $msg ) );
    }else{
        $msg = array('status' => 0, "msg" => $mail->ErrorInfo, "email" => $email, "index" => $index);
        exit( json_encode( $msg ) );
    }
    $msg = array("status" => 0, "msg" => "could not send message", "email" => $email, "index" => $index);
    exit(json_encode($msg));

我知道以前可能有人问过这个问题，但我已经尝试了所有给定的解决方案，但它们对我不起作用。

【问题讨论】：

标签： php email smtp phpmailer

【解决方案1】：

不要依赖 PHP 的邮件功能；它不安全、缓慢且难以调试。 “无法实例化...”错误通常是因为您没有正常运行的本地邮件服务器。由于您已经在使用 PHPMailer，请使用它通过 SMTP 直接发送到 Sendgrid。这些设置是部分猜测，您需要插入您的 SendGrid 凭据，但应该可以：

$mail->isSMTP();
$mail->Host = 'smtp.sendgrid.net';
$mail->SMTPSecure = 'tls';
$mail->Port = 587;
$mail->SMTPAuth = true;
$mail->Username = 'username';
$mail->Password = 'password';

如果您还设置了$mail->SMTPDebug = 2;，您将能够看到正在发生的事情。

【讨论】：