phpmailer w/smtp在几百封电子邮件之后到Mailgun，获得错误：451无法解析标题：畸形数据；意外的EOF

Question

使用phpmailer v 6.6.0与SMTP使用MailGun运行PHP 7.4.28＆amp; mysql。以下代码是在一个foreach循环中生成1000多封电子邮件。可以在本地发送电子邮件（使用phpmailer）无问题，但是在发送了一百个或更多电子邮件后，通过SMTP将外部发送到MailGun，将出现SMTP通信错误。 phpmailer调试报告的最后两个条目，＃145被发送，＃146遇到了通信错误。 MailGun说，该错误是解析MIME标头数据畸形的错误。因此，我将所有标头项目的Charset设置为UTF-8，并在phpmailer中宣布这一点，但仍然不正确。

这是MailGuns官方答复： “由于'451无法解析标头：畸形的数据；意外的eof'，这并不能提供有关该错误到底是什么的具体信息。但是，这意味着消息哑M正在畸形。这可以是因为特殊字符或无效格式，但我们又一次不知道具体细节。”

以下是phpmailer调试报告的最后两个条目。在＃145的开始和＃146的结束时，切断了几十条线，在发生错误的情况下，请不要标记为垃圾邮件。

145
...removed above lines so as not to be flagged as spam...
2022-05-27 22:40:33 CLIENT -> SERVER: This is a multi-part message in MIME format.
2022-05-27 22:40:33 CLIENT -> SERVER: 
2022-05-27 22:40:33 CLIENT -> SERVER: --b1_qTte9OeCLb4bnOH0adZvABlTFkh21zO3VRKOPoXHBs
2022-05-27 22:40:33 CLIENT -> SERVER: Content-Type: text/plain; charset=utf-8
2022-05-27 22:40:33 CLIENT -> SERVER: Content-Transfer-Encoding: base64
2022-05-27 22:40:33 CLIENT -> SERVER: 
2022-05-27 22:40:33 CLIENT -> SERVER: NS0yNy0yMjxicj5BbHRCb2R5OiBUaGlzIGlzIGEgQnVsayBSZWxheSBFbWFpbCAoU01UUCkgVGVz
2022-05-27 22:40:33 CLIENT -> SERVER: dCAvci9uIFZpYSBQSFAgNy40LjI4LCBQSFBNYWlsZXIgNi42LjAgYW5kIE1haWxndW4gd2l0aCBI
2022-05-27 22:40:33 CLIENT -> SERVER: VE1MICYgUEhQTWFpbGVyIENoYXJTZXQgPSAndXRmLTgnICwgTXlTUUwgdXRmOG1iNCA9ICd1dGY4
2022-05-27 22:40:33 CLIENT -> SERVER: bWI0JywgYW5kIFBIUE1haWxlciBFbmNvZGluZyA9ICdxdW90ZWQtcHJpbnRhYmxlJyBhbmQgdXRm
2022-05-27 22:40:33 CLIENT -> SERVER: OF9lbmNvZGUgYmVmb3JlIGVhY2ggaGVhZGVyIGVsZW1lbnQ=
2022-05-27 22:40:33 CLIENT -> SERVER: 
2022-05-27 22:40:33 CLIENT -> SERVER: --b1_qTte9OeCLb4bnOH0adZvABlTFkh21zO3VRKOPoXHBs
2022-05-27 22:40:33 CLIENT -> SERVER: Content-Type: text/html; charset=utf-8
2022-05-27 22:40:33 CLIENT -> SERVER: Content-Transfer-Encoding: base64
2022-05-27 22:40:33 CLIENT -> SERVER: 
2022-05-27 22:40:33 CLIENT -> SERVER: PHA+NS0yNy0yMjxicj5Cb2R5OiBUaGlzIGlzIGEgQnVsayBSZWxheSBFbWFpbCAoU01UUCkgVGVz
2022-05-27 22:40:33 CLIENT -> SERVER: dDxicj5WaWEgUEhQIDcuNC4yOCwgUEhQTWFpbGVyIDYuNi4wIGFuZCBNYWlsZ3VuIHdpdGggSFRN
2022-05-27 22:40:33 CLIENT -> SERVER: TCAmIFBIUE1haWxlciBDaGFyU2V0ID0gIlVURi04IiAsIE15U1FMICRjaGFyc2V0ID0gInV0Zjht
2022-05-27 22:40:33 CLIENT -> SERVER: YjQiLCBhbmQgUEhQTWFpbGVyIEVuY29kaW5nID0gInF1b3RlZC1wcmludGFibGUiIGFuZCB1dGY4
2022-05-27 22:40:33 CLIENT -> SERVER: X2VuY29kZSBiZWZvcmUgZWFjaCBoZWFkZXIgZWxlbWVudDwvcD4=
2022-05-27 22:40:33 CLIENT -> SERVER: 
2022-05-27 22:40:33 CLIENT -> SERVER: 
2022-05-27 22:40:33 CLIENT -> SERVER: --b1_qTte9OeCLb4bnOH0adZvABlTFkh21zO3VRKOPoXHBs--
2022-05-27 22:40:33 CLIENT -> SERVER: 
2022-05-27 22:40:33 CLIENT -> SERVER: .
2022-05-27 22:40:34 SERVER -> CLIENT: 250 Great success
2022-05-27 22:40:34 CLIENT -> SERVER: RSET
2022-05-27 22:40:34 SERVER -> CLIENT: 250 OK


Message ([email protected]) has been sent successfully

146
2022-05-27 22:40:35 CLIENT -> SERVER: QUIT
2022-05-27 22:40:35 SERVER -> CLIENT: 221 See you later. Yours truly, Mailgun
2022-05-27 22:40:35 Connection: closed
2022-05-27 22:40:35 Connection: opening to smtp.mailgun.org:587, timeout=300, options=array()
2022-05-27 22:40:35 Connection: opened
2022-05-27 22:40:35 SERVER -> CLIENT: 220 Mailgun Influx ready
2022-05-27 22:40:35 CLIENT -> SERVER: EHLO www.company.com
2022-05-27 22:40:35 SERVER -> CLIENT: 250-smtp-out-n03.prod.us-west-2.postgun.com250-AUTH PLAIN LOGIN250-SIZE 52428800250-8BITMIME250-SMTPUTF8250-PIPELINING250 STARTTLS
2022-05-27 22:40:35 CLIENT -> SERVER: STARTTLS
2022-05-27 22:40:35 SERVER -> CLIENT: 220 Go ahead
2022-05-27 22:40:35 CLIENT -> SERVER: EHLO www.company.com
2022-05-27 22:40:35 SERVER -> CLIENT: 250-smtp-out-n03.prod.us-west-2.postgun.com250-AUTH PLAIN LOGIN250-SIZE 52428800250-8BITMIME250-SMTPUTF8250 PIPELINING
2022-05-27 22:40:35 CLIENT -> SERVER: AUTH LOGIN
2022-05-27 22:40:35 SERVER -> CLIENT: 334 VXNlcm5hbWU6
2022-05-27 22:40:35 CLIENT -> SERVER: [credentials hidden]
2022-05-27 22:40:35 SERVER -> CLIENT: 334 UGFzc3dvcmQ6
2022-05-27 22:40:35 CLIENT -> SERVER: [credentials hidden]
2022-05-27 22:40:36 SERVER -> CLIENT: 235 Authentication successful
2022-05-27 22:40:36 CLIENT -> SERVER: MAIL FROM:<[email protected]>
2022-05-27 22:40:36 SERVER -> CLIENT: 250 Sender address accepted
2022-05-27 22:40:36 CLIENT -> SERVER: RCPT TO:<[email protected]>
2022-05-27 22:40:36 SERVER -> CLIENT: 250 Recipient address accepted
2022-05-27 22:40:36 CLIENT -> SERVER: DATA
2022-05-27 22:40:36 SERVER -> CLIENT: 354 Continue
2022-05-27 22:40:36 CLIENT -> SERVER: Date: Fri, 27 May 2022 17:40:35 -0500
2022-05-27 22:40:36 CLIENT -> SERVER: To: Ryne Allen <[email protected]>
2022-05-27 22:40:36 CLIENT -> SERVER: From: My Company <[email protected]>
2022-05-27 22:40:36 CLIENT -> SERVER: Reply-To: My Company <[email protected]>
2022-05-27 22:40:36 CLIENT -> SERVER: Subject: #146g-SMTP-MG-Test -> To: 10591 of [email protected]
2022-05-27 22:40:36 CLIENT -> SERVER: Message-ID: <[email protected]>
2022-05-27 22:40:36 CLIENT -> SERVER: X-Mailer: PHPMailer 6.6.0 (https://github.com/PHPMailer/PHPMailer)
2022-05-27 22:40:36 CLIENT -> SERVER: MIME-Version: 1.0
2022-05-27 22:40:36 CLIENT -> SERVER: Content-Type: multipart/alternative;
2022-05-27 22:40:36 CLIENT -> SERVER: boundary="b1_uBrObwrxzuPlfV2uIa8T2UUNuG4VAPAYqyNHqCgy24"
2022-05-27 22:40:36 CLIENT -> SERVER: 
2022-05-27 22:40:36 CLIENT -> SERVER: This is a multi-part message in MIME format.
2022-05-27 22:40:36 CLIENT -> SERVER: 
2022-05-27 22:40:36 CLIENT -> SERVER: 0krd GaOmW,:36u0ZoeKeWKeWKX t.j5yIZ hctyllnNAnaRn l t.ZlUB1ATCuSAu1UhZNpZu1UhZNpZBR4pf-Rn l t.ZlUB1ATCuSAu1UhZNpZu1UhZNpZBR4pf-Rn l undara0iipanzWT:l_NT -> SERVER: 
2022-05-27 22:40:36 CLIENT -> SERVER: 0krd GaOmW,:36u0ZoeKeWKeWp2.
2022-05-27 22:40:36 CLIENT --1e: mIR7VER: This is a multi-part SERVER: 0krd GaOmW,:36u0ZoeKeWKeWp2.
2022-05-27 22:40:36 CLIENT -> SERVER: 
2022-.W,:36u0ZoeKeWKeWKX t.j5yIZ hctyllnIJ9IWeKeWeoeKeWKeWKX t.j5yIZ hctyllnNAnaRn l t.ZlUB1ATCuSAua40:3VF4 I mUmUmUmUala::: Ga l t.ZlUNidJ@dDWllDWllDSDeITCEFIpe-GGa l t.ZlUNidJ@dDWllDWllDSDeITCEFIpe-GGa l t.ZlUNidJ@dDWllDWllDSDeITCEFIpe-GGa l t.ZlUNidJ@dDWllDWu5Do1slUNidJ@dDWllDWu5Do1slUNidJ@dDWllDWu5Do1slUNidJ@ 05-27 22:40:36 CLIENT --1e: mIR7VER: This is a muXSllDWIvE hdsttbtC IT5kbxe pGJ@dDip 
...removed last few dozen lines so not to be flagged as spam...

这是我用来使用phpmailer向MailGun发送批量电子邮件的代码：

        use PHPMailer\PHPMailer\PHPMailer;
        use PHPMailer\PHPMailer\SMTP;
        use PHPMailer\PHPMailer\Exception;
        //PHPMailer Ver 6.6.0
        require '../../PHPMailer/src/PHPMailer.php';
        require '../../PHPMailer/src/SMTP.php';     
        require '../../PHPMailer/src/Exception.php';

        $setFrom = utf8_encode('[email protected]');
        $FromNam = utf8_encode('My Company');
        $ReplyTo = utf8_encode('[email protected]');
        $ReplNam = utf8_encode('My Company');
        $Address = utf8_encode('[email protected]');
        $AddrNam = utf8_encode('Ryne Allen');
        $Subject = utf8_encode('#'.$count.'h-SMTP-MG-Test -> To: '.$row["mnrID"].' of '.$row["cont_email"]);

        $mail = new PHPMailer(true); 
        $mail->CharSet = 'utf-8';   
        $mail->Encoding = 'base64';

        $mail->isSMTP();
        $mail->SMTPKeepAlive = true; 
        $mail->Host = 'smtp.mailgun.org';
        $mail->Port = '587';
        $mail->SMTPAuth = true; 
        $mail->Username = '[email protected]';  
        $mail->Password = 'xxxxxx';
        $mail->SMTPSecure = 'tls';
        $mail->SMTPDebug = 3;
        
        $mail->setFrom($setFrom, $FromNam);
        $mail->addReplyTo($ReplyTo, $ReplNam);
        $mail->addAddress($Address, $AddrNam);
        $mail->isHTML(true);
        $mail->Subject = $Subject; 
        
        //An HTML message body
        $mail->Body = utf8_encode('<p>5-27-22<br>Body: This is a Bulk Relay Email (SMTP) Test<br>Via PHP 7.4.28, PHPMailer 6.6.0 and Mailgun with HTML & PHPMailer CharSet = "utf-8" , MySQL $charset = "utf8mb4", and PHPMailer Encoding = "base64" and utf8_encode before each header element</p>');
        $mail->AltBody = utf8_encode("5-27-22<br>AltBody: This is a Bulk Relay Email (SMTP) Test /r/n Via PHP 7.4.28, PHPMailer 6.6.0 and Mailgun with HTML & PHPMailer CharSet = 'utf-8' , MySQL $charset = 'utf8mb4', and PHPMailer Encoding = 'base64' and utf8_encode before each header element");


       try {
           $mail->send();
           echo "<br>Message (".$row["cont_email"].") has been sent successfully<br>";
       } catch (Exception $e) {
           echo 'Message could not be sent.';
           echo "Mailer Error: " . $mail->ErrorInfo;
       }

任何帮助都将不胜感激。我尝试设置$ ail-＆gt; encoding ='quoted printable'而不是'base64'和$ aim-＆gt; charset ='utf-8'而不是我阅读的较低案例'utf-8'问题。

Answer 1

没什么明显的，但是您正在做几件事不太正确。

您不应该在PHP 7.4上进行任何新的开发。它是从活动支持中，并且很快就会停止获得安全补丁。

避免utf8_encode函数;无论如何，您的代码和数据都应在UTF-8中，如果是，则该功能会损坏您的文本。它已经在PHP 9 中将被删除。

端口期望一个整数，而不是字符串；使用$邮件 - ＆gt; port = 587。

不要将base64编码用于HTML零件；它使您看起来像垃圾邮件发送者，只需让phpmailer使用其默认编码（8位，Mailgun支持）。

您正在设置smtpkeepalive，但是您没有发送循环，因此它不会实现任何目标。请参阅 phpmailer邮件列表示例。这应该使您的发送速度更快。

现在到您的数据上：

2022-05-27 22:40:36 CLIENT -> SERVER: 0krd GaOmW,:36u0ZoeKeWKeWKX t.j5yIZ hctyllnNAnaRn l t.ZlUB1ATCuSAu1UhZNpZu1UhZNpZBR4pf-Rn l t.ZlUB1ATCuSAu1UhZNpZu1UhZNpZBR4pf-Rn l undara0iipanzWT:l_NT -> SERVER: 
2022-05-27 22:40:36 CLIENT -> SERVER: 0krd GaOmW,:36u0ZoeKeWKeWp2.
2022-05-27 22:40:36 CLIENT --1e: mIR7VER: This is a multi-part SERVER: 0krd GaOmW,:36u0ZoeKeWKeWp2.

这里有些不对劲。它看起来像内存损坏或其他内容（不是网络，因为当时是本地的）。 客户端 - ＆gt;服务器字符串是phpmailer中简单的静态文本，没有机会包含其他任何东西。我建议您应用上面的其他更改，看看您如何去。

Answer 2

我尝试了多个电子邮件继电器服务，并与MailJet，SendGrid和Sendinblue产生了类似的结果。

Synchro的回应包括：“您正在设置SMTPKeepalive，但您没有发送循环，因此它不会取得任何成就。”这使我质疑操作的逻辑，而不是围绕phpmailer代码创建循环，而是在phpmailer代码中创建它，使SMTP会话保持活力，直到发送了所有[Bulk]电子邮件。

在一次发送多个（数百个）电子邮件时，我能够通过更改phpmailer逻辑来解决此问题。

新代码看起来像这样：

$cxn=mysqli_connect($host, $user, $pass, $db);
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

$query = "SELECT * FROM Recipients_tbl"; 
$result = mysqli_query($cxn, $query);
$count=0;

    //Include Required PHPMailer files:
    require_once '../../PHPMailer/src/PHPMailer.php';
    require_once '../../PHPMailer/src/SMTP.php';
    require_once '../../PHPMailer/src/Exception.php';
    //Define Namespaces.
    use PHPMailer\PHPMailer\PHPMailer;
    use PHPMailer\PHPMailer\SMTP;
    use PHPMailer\PHPMailer\Exception;



        $mail = new PHPMailer(true);    
        $mail->isSMTP();                
        $mail->SMTPKeepAlive = true; 
        $mail->SMTPDebug = false;           
        $mail->Port = 587;              
        $mail->SMTPAuth = true;         
        $mail->SMTPSecure = 'tls';      
        
        //SMTP via MailGun
        $mail->Host = 'smtp.mailgun.org';               
        $mail->Username = '[email protected]';        
        $mail->Password = 'mypass';                     
        $mail->setFrom('[email protected]', 'My Company');

        $mail->addReplyTo('[email protected]', 'My Company');        
        $mail->isHTML(true);    

    foreach($result as $row)
    {
        $count++;
        echo "<br>".$count."<br>";  
        $Subject = '#'.$count.'MailGun-SMTP-Loop-Test -> To: '.$row["mnrID"];
        $HTMBody = '<p>5-31-22<br>Body: This is a Bulk (loop) Test<br>Via MailGun</p>';
        $AltBody = "5-31-22<br>AltBody: This is a Bulk (loop) Test /r/n Via MailGun";       
                
        $mail->addAddress('[email protected]', 'Me'); //sent to me for test
        $mail->Subject = $Subject; 
        $mail->Body = $HTMBody;
        $mail->AltBody = $AltBody;

        try {
            $mail->send();
            $mail->ClearAllRecipients();
        } catch (Exception $e) {
            echo 'Mailer Error (' . htmlspecialchars($row["cont_email"]) . ') ' . $mail->ErrorInfo . '<br>';
            //Reset the connection to abort sending this message
            //The loop will continue trying to send to the rest of the list         
            $mail->getSMTPInstance()->reset();
        }
        sleep(1);
    }
    $mail->SmtpClose();