内部 php 脚本将可靠的电子邮件发送到垃圾邮件 (Outlook)

如何解决内部 php 脚本将可靠的电子邮件发送到垃圾邮件 (Outlook)

我是意大利一家名为 kokoart.it 的电子商务商店的主要程序员我在将消息从内部 PHP 脚本发送到 Outlook 收件箱时遇到困难（其他提供商没有问题）。

该网站托管在 plesk 上，并且使用 postfix 发送电子邮件服务器。
电子邮件是从 PHP 脚本发送的，使用 mail() 函数注册、忘记密码或完成购买时订购。
电子邮件收到了 spf、dkim、dmarc 的通行证。
奖励：mail-tester.com 对他们进行评分 10/10
(https://www.mail-tester.com/test-cve6g63i6)

那么这里到底发生了什么？我如何才能提高这些电子邮件的可靠性以使其正确发送？

请帮忙，我没有想法。

这里我附上一个示例消息的来源：

Received: from HE1EUR04HT078.eop-eur04.prod.protection.outlook.com
(2603:10a6:6:29::29) by DB7PR03MB3579.eurprd03.prod.outlook.com with HTTPS
via DB6P193CA0019.EURP193.PROD.outlook.com; Wed,27 Jan 2021 13:33:03 +0000
Received: from HE1EUR04FT027.eop-eur04.prod.protection.outlook.com
(2a01:111:e400:7e0d::44) by
HE1EUR04HT078.eop-eur04.prod.protection.outlook.com (2a01:111:e400:7e0d::102)
with Microsoft SMTP Server (version=TLS1_2,cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3784.11; Wed,27 Jan
2021 13:33:03 +0000
Authentication-Results: spf=pass (sender IP is 212.227.193.184)
smtp.mailfrom=kokoart.it; live.it; dkim=pass (signature was verified)
header.d=kokoart.it;live.it; dmarc=pass action=none
header.from=kokoart.it;compauth=pass reason=100
Received-SPF: Pass (protection.outlook.com: domain of kokoart.it designates
212.227.193.184 as permitted sender) receiver=protection.outlook.com;
client-ip=212.227.193.184; helo=kokoart.it;
Received: from kokoart.it (212.227.193.184) by
HE1EUR04FT027.mail.protection.outlook.com (10.152.27.30) with Microsoft SMTP
Server id 15.20.3784.11 via Frontend Transport; Wed,27 Jan 2021 13:33:03
+0000
X-IncomingTopHeaderMarker:
OriginalChecksum:2058771F4AE1E5566B7DBACE5724416D246C304E5C8A0B682244EFC8D48E4374;UpperCasedChecksum:2AC0BCD85F92251DA8EE83273E1C49AE8F3B8D9AC24305B48316C45A8F9601D1;SizeAsReceived:744;Count:9
Received: by kokoart.it (Postfix,from userid 10000)
id DC3B865476; Wed,27 Jan 2021 14:33:02 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kokoart.it;
s=default; t=1611754382;
bh=nBTZ4TjvBgORbLML+2Pg2c+dx4/CJsYz7hy4BiQ/zJ4=; h=To:Subject:From;
b=LtAoTwk3VjPUDf39U2azRFVbZLDQrp7g2zRrR64N5d3VnlgGBY4KNSnHxp1J/fqW2
rwOzHOVacaClw0oEJO8D2BVhrlX54k+Qc3oO5c0R2MZSqiv6tXn0QpFQ7pBhpvmp2I
IyF8JD8CZzYHoMdVU5srikXhCJGL7l1pDki2niJE=
To: ale12manto@live.it
Subject: Thank you for your purchase.
From: kokoart.it <supporto@kokoart.it>
Content-Type: multipart/alternative; boundary="60116b8ecdbc1"
Message-Id: <20210127133302.DC3B865476@kokoart.it>
Date: Wed,27 Jan 2021 14:33:02 +0100 (CET)
X-IncomingHeaderCount: 9
Return-Path: kokoart@kokoart.it
X-MS-Exchange-Organization-ExpirationStartTime: 27 Jan 2021 13:33:03.3233
(UTC)
X-MS-Exchange-Organization-ExpirationStartTimeReason: OriginalSubmit
X-MS-Exchange-Organization-ExpirationInterval: 1:00:00:00.0000000
X-MS-Exchange-Organization-ExpirationIntervalReason: OriginalSubmit
X-MS-Exchange-Organization-Network-Message-Id:
c6645106-bd08-4ce7-6717-08d8c2c8128a
X-EOPAttributedMessage: 0
X-EOPTenantAttributedMessage: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa:0
X-MS-Exchange-Organization-MessageDirectionality: Incoming
X-MS-PublicTrafficType: Email
X-MS-Exchange-Organization-AuthSource:
HE1EUR04FT027.eop-eur04.prod.protection.outlook.com
X-MS-Exchange-Organization-AuthAs: Anonymous
X-MS-UserLastlogonTime: 1/27/2021 1:27:27 PM
X-MS-Office365-Filtering-Correlation-Id: c6645106-bd08-4ce7-6717-08d8c2c8128a
X-MS-TrafficTypeDiagnostic: HE1EUR04HT078:
X-MS-Exchange-EOPDirect: true
X-Sender-IP: 212.227.193.184
X-SID-PRA: SUPPORTO@KOKOART.IT
X-SID-Result: PASS
X-MS-Exchange-Organization-PCL: 2
X-MS-Exchange-Organization-SCL: 0
X-Microsoft-Antispam: BCL:0;
X-OriginatorOrg: outlook.com
X-MS-Exchange-Crosstenant-OriginalArrivalTime: 27 Jan 2021 13:33:03.2723
(UTC)
X-MS-Exchange-Crosstenant-Network-Message-Id: c6645106-bd08-4ce7-6717-08d8c2c8128a
X-MS-Exchange-Crosstenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa
X-MS-Exchange-Crosstenant-AuthSource:
HE1EUR04FT027.eop-eur04.prod.protection.outlook.com
X-MS-Exchange-Crosstenant-AuthAs: Anonymous
X-MS-Exchange-Crosstenant-FromEntityHeader: Internet
X-MS-Exchange-Crosstenant-RMS-PersistedConsumerOrg:
00000000-0000-0000-0000-000000000000
X-MS-Exchange-Transport-CrosstenantHeadeRSStamped: HE1EUR04HT078
X-MS-Exchange-Transport-EndToEndLatency: 00:00:00.4768981
X-MS-Exchange-Processed-By-BccFoldering: 15.20.3784.017
X-Microsoft-Antispam-MailBox-Delivery:
abwl:0;wl:0;pcwl:0;kl:0;iwl:0;dwl:0;dkl:0;rwl:0;ucf:0;jmr:0;ex:0;auth:1;dest:J;OFR:SpamFilterauthJ;ENG:(5062000282)(90000117)(90005022)(91005020)(91035115)(9000001)(9005001)(9015001)(9025001)(9030002)(9050020)(9100273)(5061607266)(5061608174)(4900115)(2008001094)(2008000189)(2008019284)(2008120284)(8390226)(98390106)(58390106)(8391040)(4920090)(6350099)(4950131)(4990090)(9140004);RF:JunkEmail;
X-Message-Info:
qoGN4b5S4yrrb8vqK2fp63ec1Rx80448A0SJoP+at5caOhjbAPLieusISQ9KycDL1ksqODtUi1ASZnKpQCz9mAp2qD2RCT4/l0/Ytil25BosptM6sTMxafRr/AiXpVY1Ya7q0lRNXSb65tgXP416NYpnRDJkhNCnd/vHEdVGbd7aQcAAaOrZhR1VjnULNvo6nzmLjBrlYZxMJT1KH8+OQQ==
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MjtHRD0yO1NDTD02
X-Microsoft-Antispam-Message-Info:
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我一直使用 PHPMailer 库，并创造了奇迹，但由于某些晦涩的原因，消息无法再获得正确的 DKIM 签名。这阻止了实际发送到任何 Outlook 收件箱。所以我选择了一种更简单的方法，现在正在发送电子邮件，但无缘无故地标记为垃圾邮件。我愿意接受任何类型的解决方案、建议或任何事情。

提前致谢。