php - 如何使用 PHPMailer 修复 SMTP 身份验证邮件进入垃圾邮件

Question

我们在域 (domain1.com) 上有一个网站。我们想使用 PHPMailer 从这个网站发送一封电子邮件。我们正在使用 1&1 Ionos (smtp.ionos.co.uk) 对 SMTP 服务器进行身份验证。此 SMTP 服务器不是用于 domain1.com，而是用于 domain2.com。

网站在 domain1.com 上但我们试图通过 domain2.com 的邮件服务器发送的原因是由于某种原因，我们客户的 IT 支持无法为我们提供 domain1.com 的 SMTP。

当我们使用 domain2.com 的 SMTP 从 domain1.com 发送电子邮件时，它会进入 junk/spam 文件夹。

我相信当通过有效的 SMTP 服务器发送时，它会到达收件箱。我们还没有设置 SPF 记录，因为我不确定它应该是什么：

1. 我应该添加网络服务器还是 smtp 服务器？
2. 是否应该将 SPF 记录添加到 domain2.com 的 dns 中？

我注意到我也收到了 5 的 SCL。

    $mail->SMTPDebug = 3;
    $mail->isSMTP();
    $mail->Host       = 'smtp.ionos.co.uk';
    $mail->SMTPAuth   = true;
    $mail->Username   = '[e-mail]';
    $mail->Password   = '[PASSWORD]';
    $mail->Port       = 587;
    $mail->SMTPSecure = 'tls';

    //Recipients
    $mail->setFrom('[e-mail]', 'Sender');
    $mail->addAddress('[e-mail]', 'Receiver');

    // Content
    $mail->isHTML(true);
    $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();

我预计结果是在收件箱中收到发送到 [e-mail] 的电子邮件，发件人是 [e-mail]。

实际结果是它到达垃圾邮件/垃圾邮件文件夹。

以下是 PHPMailer 的输出：（ 我们使用的域已替换为 domain1.com 和 domain2.com。

2019-07-19 12:51:12 Connection: opening to smtp.ionos.co.uk:587, timeout=300, options=array()
2019-07-19 12:51:12 Connection: opened
2019-07-19 12:51:12 SERVER -> CLIENT: 220 kundenserver.de (mreue010) Nemesis ESMTP Service ready
2019-07-19 12:51:12 CLIENT -> SERVER: EHLO domain1.com
2019-07-19 12:51:12 SERVER -> CLIENT: 250-kundenserver.de Hello domain1.com [109.228.60.45]250-8BITMIME250-AUTH LOGIN PLAIN250-SIZE 69920427250 STARTTLS
2019-07-19 12:51:12 CLIENT -> SERVER: STARTTLS
2019-07-19 12:51:13 SERVER -> CLIENT: 220 OK
2019-07-19 12:51:13 CLIENT -> SERVER: EHLO domain1.com
2019-07-19 12:51:13 SERVER -> CLIENT: 250-kundenserver.de Hello domain1.com [109.228.60.45]250-8BITMIME250-AUTH LOGIN PLAIN250 SIZE 69920427
2019-07-19 12:51:13 CLIENT -> SERVER: AUTH LOGIN
2019-07-19 12:51:13 SERVER -> CLIENT: 334 VXNlcm5hbWU6
2019-07-19 12:51:13 CLIENT -> SERVER: <credentials hidden>
2019-07-19 12:51:13 SERVER -> CLIENT: 334 UGFzc3dvcmQ6
2019-07-19 12:51:13 CLIENT -> SERVER: <credentials hidden>
2019-07-19 12:51:13 SERVER -> CLIENT: 235 Authentication succeeded
2019-07-19 12:51:13 CLIENT -> SERVER: MAIL FROM:<[e-mail]>
2019-07-19 12:51:13 SERVER -> CLIENT: 250 Requested mail action okay, completed
2019-07-19 12:51:13 CLIENT -> SERVER: RCPT TO:<[e-mail]>
2019-07-19 12:51:13 SERVER -> CLIENT: 250 OK
2019-07-19 12:51:13 CLIENT -> SERVER: DATA
2019-07-19 12:51:13 SERVER -> CLIENT: 354 Start mail input; end with <CRLF>.<CRLF>
2019-07-19 12:51:13 CLIENT -> SERVER: Date: Fri, 19 Jul 2019 12:51:12 +0000
2019-07-19 12:51:13 CLIENT -> SERVER: To: Receiver <[e-mail]>
2019-07-19 12:51:13 CLIENT -> SERVER: From: Sender <[e-mail]>
2019-07-19 12:51:13 CLIENT -> SERVER: Subject: Here is the subject
2019-07-19 12:51:13 CLIENT -> SERVER: Message-ID: <[e-mail]>
2019-07-19 12:51:13 CLIENT -> SERVER: X-Mailer: PHPMailer 6.0.7 (https://github.com/PHPMailer/PHPMailer)
2019-07-19 12:51:13 CLIENT -> SERVER: MIME-Version: 1.0
2019-07-19 12:51:13 CLIENT -> SERVER: Content-Type: multipart/alternative;
2019-07-19 12:51:13 CLIENT -> SERVER: boundary="b1_pBl5X5mLOx1thDYn6AUiNl4bjQ670HqkyflaaOGMH9I"
2019-07-19 12:51:13 CLIENT -> SERVER: Content-Transfer-Encoding: 8bit
2019-07-19 12:51:13 CLIENT -> SERVER:
2019-07-19 12:51:13 CLIENT -> SERVER: This is a multi-part message in MIME format.
2019-07-19 12:51:13 CLIENT -> SERVER: --b1_pBl5X5mLOx1thDYn6AUiNl4bjQ670HqkyflaaOGMH9I
2019-07-19 12:51:13 CLIENT -> SERVER: Content-Type: text/plain; charset=us-ascii
2019-07-19 12:51:13 CLIENT -> SERVER:
2019-07-19 12:51:13 CLIENT -> SERVER: This is the body in plain text for non-HTML mail clients
2019-07-19 12:51:13 CLIENT -> SERVER:
2019-07-19 12:51:13 CLIENT -> SERVER: --b1_pBl5X5mLOx1thDYn6AUiNl4bjQ670HqkyflaaOGMH9I
2019-07-19 12:51:13 CLIENT -> SERVER: Content-Type: text/html; charset=us-ascii
2019-07-19 12:51:13 CLIENT -> SERVER:
2019-07-19 12:51:13 CLIENT -> SERVER: This is the HTML message body <b>in bold!</b>
2019-07-19 12:51:13 CLIENT -> SERVER:
2019-07-19 12:51:13 CLIENT -> SERVER:
2019-07-19 12:51:13 CLIENT -> SERVER: --b1_pBl5X5mLOx1thDYn6AUiNl4bjQ670HqkyflaaOGMH9I--
2019-07-19 12:51:13 CLIENT -> SERVER:
2019-07-19 12:51:13 CLIENT -> SERVER: .
2019-07-19 12:51:13 SERVER -> CLIENT: 250 Requested mail action okay, completed: id=1MHXWL-1havq40lUn-00DZMt
2019-07-19 12:51:13 CLIENT -> SERVER: QUIT
2019-07-19 12:51:13 SERVER -> CLIENT: 221 kundenserver.de Service closing transmission channel
2019-07-19 12:51:13 Connection: closed
Message has been sent

这是收到的电子邮件的标题：

Received: from CWXP265MB1255.GBRP265.PROD.OUTLOOK.COM (2603:10a6:401:53::17)
 by CWLP265MB1252.GBRP265.PROD.OUTLOOK.COM with HTTPS via
 CWLP265CA0125.GBRP265.PROD.OUTLOOK.COM; Fri, 19 Jul 2019 08:48:43 +0000
Received: from LO2P265CA0346.GBRP265.PROD.OUTLOOK.COM (20.176.151.150) by
 CWXP265MB1255.GBRP265.PROD.OUTLOOK.COM (20.176.46.18) with Microsoft SMTP
 Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
 15.20.2073.14; Fri, 19 Jul 2019 08:48:41 +0000
Received: from LO2GBR01FT016.eop-gbr01.prod.protection.outlook.com
 (2a01:111:f400:7e15::205) by LO2P265CA0346.outlook.office365.com
 (2603:10a6:600:d::22) with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.2094.14 via Frontend
 Transport; Fri, 19 Jul 2019 08:48:41 +0000
Authentication-Results: spf=none (sender IP is 212.227.126.130)
 smtp.mailfrom=domain2.com; domain3.com; dkim=none (message not signed)
 header.d=none;domain3.com; dmarc=none action=none
 header.from=domain2.com;compauth=fail reason=001
Received-SPF: None (protection.outlook.com: domain2.com does not
 designate permitted sender hosts)
Received: from mout.kundenserver.de (212.227.126.130) by
 LO2GBR01FT016.mail.protection.outlook.com (10.152.42.102) with Microsoft SMTP
 Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id
 15.20.2052.18 via Frontend Transport; Fri, 19 Jul 2019 08:48:41 +0000
Received: from domain1.com ([REDACTED]) by mrelayeu.kundenserver.de
 (mreue011 [213.165.67.99]) with ESMTPSA (Nemesis) id
 1Mt7Ll-1ih3S51mbR-00tR6X; Fri, 19 Jul 2019 10:48:40 +0200
Date: Fri, 19 Jul 2019 08:48:40 +0000
To: Domain 3 <[e-mail]>
From: Domain 2 <[e-mail]>
Reply-To: Sender <[e-mail]>
Subject: New Contact Form Submission
Message-ID: <[e-mail]>
X-Mailer: PHPMailer 6.0.7 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: multipart/alternative;
    boundary="b1_Lf43d2831QWJXJRRec3pYAMiqXeMEtR7loF8JA"
Content-Transfer-Encoding: 8bit
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X-Spam-Flag: NO
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Return-Path: [e-mail]
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 CIP:212.227.126.130;IPV:NLI;CTRY:DE;EFV:NLI;SFV:SPM;SFS:(2980300002)(428003)(52294003)(199004)(189003)(43066004)(36756003)(3480700005)(9686003)(67896002)(55016002)(63394003)(5566004)(71850400003)(7596002)(305945005)(6916009)(40080500001)(7636002)(2160300002)(5660300002)(122186004)(8676002)(54206008)(86362001)(5000100001)(246002)(2870700001)(53416004)(16003)(356004)(71816002)(4326008)(1096003)(7696005)(50226002)(23466002)(107886003)(69370400003);DIR:INB;SFP:;SCL:5;SRVR:CWXP265MB1255;H:mout.kundenserver.de;FPR:;SPF:None;LANG:en;PTR:mout.kundenserver.de;A:1;MX:1;CAT:SPOOF;
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