대형 이메일 제공업체(예: Google, Microsoft)에서만 자체 호스팅 Discourse 인스턴스로 이메일이 전달되지 않는 문제를 겪고 계신 분이 더 계신가요? 저는 로컬 이메일 서버, iCloud, ProtonMail을 사용하여 인스턴스로 이메일을 보내는 데는 문제가 없지만, Gmail(Workspace 이메일 포함) 및 Office 365 기반 이메일을 보내면 다음과 같은 오류가 발생합니다:
## 메시지 전달 실패
**[xxx@example.com](mailto:xxx@example.com)** 으로 메시지를 전달하는 중 문제가 발생했습니다. 아래 기술적 세부 정보를 확인하세요.
응답 내용:
read error: FAILED_PRECONDITION: read error (104): Connection reset by peer
Reporting-MTA: dns; [googlemail.com](http://googlemail.com/)
Arrival-Date: Tue, 02 Nov 2021 13:12:55 -0700 (PDT)
X-Original-Message-ID: <[CAAY3Td6W+9uYHRVJ6A8=9pG4LhaJrYRAN16CWe=3_2gG9TH7Uw@mail.gmail.com](mailto:CAAY3Td6W+9uYHRVJ6A8=9pG4LhaJrYRAN16CWe=3_2gG9TH7Uw@mail.gmail.com)>
Final-Recipient: rfc822; [xxx@example.com](mailto:xxx@example.com)
Action: failed
Status: 4.4.2
Remote-MTA: dns; [reply-mx.example.com](http://reply-mx.example.com/). (xxx.yyy.zzz.163, the server for
the domain [example.com](http://example.com/).)
Diagnostic-Code: smtp; read error: FAILED_PRECONDITION: read error (104): Connection reset by peer
Last-Attempt-Date: Fri, 05 Nov 2021 17:08:12 -0700 (PDT)
>
**From:** Kartik <[yyy@gmail.com](mailto:yyy@gmail.com)>
**Subject:** **Test from Gmail**
**Date:** Tuesday, November 2, 2021 at 3:12:39 PM CDT
**To:** [xxx@example.com](mailto:xxx@example.com)
[details="또는 O365의 경우 'Socket error ConnectionReset':"]
From: Microsoft Outlook <MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@example.onmicrosoft.com>
Sent: Wednesday, October 13, 2021 10:32 AM
To: xxx@example.com <xxx@example.com>
Subject: Undeliverable: email subject here
>
Delivery has failed to these recipients or groups:
xxx@example.com (xxx@example.com)
Your message wasn't delivered. Despite repeated attempts to deliver your message, a connection to the remote server couldn't be made.
Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that your email system is unable to connecto their email system. Give them the error details shown below. It's likely that the recipient's email admin is the only one who can fix this problem.
For more information and tips to fix this issue see this article: https://go.microsoft.com/fwlink/?LinkId=389361.
>
Diagnostic information for administrators:
Generating server: example.namprd11.prod.outlook.com
Receiving server: example.namprd11.prod.outlook.com
Total retry attempts: 2
xxx@example.com
10/13/2021 4:32:36 PM - Server at example.namprd11.prod.outlook.com returned '550 5.4.317 Message expired, cannot connect to remote server(451 4.4.0 Socket error ConnectionReset)'
10/13/2021 4:22:34 PM - Server at example.com (xxx.yyy.zzz.163) returned '450 4.4.317 Cannot connect to remote server [Message=451 4.4.0 Socket error ConnectionReset] [LastAttemptedServerName=example.com] [LastAttemptedIP=xxx.yyy.zzz.163:25] [example.eop-nam12.prod.protection.outlook.com](451 4.4.0 Socket error ConnectionReset)'
>
Original message headers:
>
Received: from example.namprd11.prod.outlook.com (xxxx:yyyy:a03:b4::21)
by example.namprd11.prod.outlook.com (xxxx:yyyy:a03:f8::11) with
Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4608.15; Wed, 13 Oct
2021 03:11:53 +0000
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none;
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ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com;
s=arcselector9901;
h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1;
bh=4qNxxT0bvj1VwRu/5YxkBRshn152flq9Jpqxd++d/7Y=;
b=ivfoKOUYCIUSTkeZHGED+fnUfSkUZxAMpIqhKboodj+WWjHSv87bRkViKCWMTY4Fwhf4v/pdU93SKhqggMuK+mgLSR4o0sTfpmfW2ntTfPpvoqOp3c/+e4Ds6jrocfUscgiVY2A/8n/+3SQMKpbuBr/q447+csvoDpBHLyXiLUMAVp+AG59SQTdWJGWxetrVETG1aKgWtUZrbxjxAHyPFx3KfcWEyTmTgNALw7erzZ+dWF/vBE1VMY1ba0ENqw+LQhuDX8j3n80BNqfEcA4MIH81sWh6b0psOT9vOKoVbd+QLo94mG0rQt99VuFWO1aJBbTH4VcazRP4AQ3+bGlmAg==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass
smtp.mailfrom=example.com; dmarc=pass action=none header.from=example.com;
dkim=pass header.d=example.com; arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=example.onmicrosoft.com; s=selector2-example-onmicrosoft-com;
h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
bh=4qNxxT0bvj1VwRu/5YxkBRshn152flq9Jpqxd++d/7Y=;
b=NBC4nesUgwixI6/lOOi5caFpky+N4yWxq3k2BuhAZB/gYgZK4nzm/jxQn8Enr1V8h7RF50rCiZPUqTdifblfZkUg5TNttyHGmxO5fjn5vYFLoyP2qWHxGHf1p5j2VhRqzqdHmiGu50J2yWnQCn/XT4pkQT30jqEj2wiFVGRreoM=
Received: from example2.namprd11.prod.outlook.com (xxxx:yyyy:a03:2ad::14)
by example.namprd11.prod.outlook.com (xxxx:yyyy:a03:b4::21) with
Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.18; Tue, 12 Oct
2021 16:27:30 +0000
Received: from example2.namprd11.prod.outlook.com
([xxxx::yyyy:82ac:bef9:609c]) by example2.namprd11.prod.outlook.com
([xxxx::yyyy:82ac:bef9:609c%6]) with mapi id 15.20.4587.026; Tue, 12 Oct 2021
16:27:30 +0000
From: First Last <fname@example.com>
To: "reciepient@example.com" <reciepient@example.com>
CC: "xxx@example.com" <xxx@example.com>
Subject: email subject here
Thread-Topic: email subject here
Thread-Index: AQHXv4U3rrvQuLjuyE6Hw8DbZvWdCw==
Date: Tue, 12 Oct 2021 16:27:30 +0000
Message-ID: <example2943732845882FABC52E0D8B69@example2.namprd11.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
suggested_attachment_session_id: 5ea385f1-0b28-519a-27de-5e0a4bfcfbb3
authentication-results: example.com; dkim=none (message not signed)
header.d=none;example.com; dmarc=none action=none
header.from=example.com;
x-ms-publictraffictype: Email
x-ms-office365-filtering-correlation-id: 330c48b5-7a5b-431d-b01c-08d98d9d2fe5
x-ms-traffictypediagnostic: example:|example:
x-ms-exchange-atpmessageproperties: SA|SL
x-microsoft-antispam-prvs: <exampleD172896FB93810003494D8B69@example.namprd11.prod.outlook.com>
x-ms-oob-tlc-oobclassifiers: OLM:9508;
x-ms-exchange-senderadcheck: 1
x-ms-exchange-antispam-relay: 0
x-microsoft-antispam: BCL:0;
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x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:example2.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(66946007)(6506007)(166002)(91956017)(76116006)(508600001)(75432002)(786003)(4326008)(9686003)(66446008)(66556008)(64756008)(66476007)(55016002)(7696005)(316002)(38070700005)(8676002)(186003)(26005)(8936002)(52536014)(19627405001)(5660300002)(38100700002)(86362001)(296002)(33656002)(2906002)(71200400001)(122000001)(6916009);DIR:OUT;SFP:1102;
x-ms-exchange-antispam-messagedata-chunkcount: 1
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MIME-Version: 1.0
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X-MS-Exchange-CrossTenant-Network-Message-Id: 330c48b5-7a5b-431d-b01c-08d98d9d2fe5
X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Oct 2021 16:27:30.1275
(UTC)
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또한 제가 즉시 적용한 최근 postfix 업데이트가 문제의 근본 원인일 것이라고 일부러 의심했지만, 이를 확인하지는 못했습니다. 예를 들어, 새 업데이트로 인한 공격적인 스팸 차단이 문제일 수 있지만, 이것이 사실임을 어떻게 확인할 수 있을까요?
이 문제는 최소한 9월 말/10월 초부터 발생하고 있습니다. 무엇이 잘못되었는지 진단하는 데 도움이 될 커뮤니티의 아이디어나 제안이 있다면 정말 감사하겠습니다.