MIME 消息无效 AWS SES 由于 MIME 消息无效而拒绝它

Posted 2023-03-15

【中文标题】MIME 消息无效 AWS SES 由于 MIME 消息无效而拒绝它

【英文标题】：Invalid MIME Message AWS SES is rejecting it due to invalid MIME message

【发布时间】：2012-04-07 21:08:49

【问题描述】：

我正在尝试通过 AWS 简单电子邮件服务发送附件，我可以让它发送没有附件的原始电子邮件，但是当我尝试使用附件时它总是失败。我是否正确构建了我的 MIME 消息？

好的，这是正确发送的 MIME：

From: [e-mail]
To: [e-mail]
Subject: Test Email
Content-Type: multipart/mixed;
  boundary="_003_97DCB304C5294779BEBCFC8357FCC4D2"
MIME-Version: 1.0

--_003_97DCB304C5294779BEBCFC8357FCC4D2
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Hello, This is a test email.

当我附加附件时发送失败：

From: [e-mail]
To: [e-mail]
Subject: Test Email
Content-Type: multipart/mixed;
  boundary="_003_97DCB304C5294779BEBCFC8357FCC4D2"
MIME-Version: 1.0

--_003_97DCB304C5294779BEBCFC8357FCC4D2
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Hello, This is a test email.

--_003_97DCB304C5294779BEBCFC8357FCC4D2
Content-Type: text/txt; name="test.txt"
Content-Description: test.txt
Content-Disposition: attachment; filename="test.txt";
Content-Transfer-Encoding: base64

VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudC4=

--_003_97DCB304C5294779BEBCFC8357FCC4D2

有什么明显的错误吗？

我通过对整个消息进行 base64 编码并将其添加到此 URL 的末尾来构建调用：

Action=SendRawEmail&Destinations.member.1=test%40example.com&RawMessage.Data=base64 encoded MIME Message

回答：

MIME 文件存在两个问题。首先

尾随边界不应该在那里，因为它显然是在寻找 MIME 消息的另一个方面，例如另一个附件。

定义为“text/txt”的Content-Type实际上应该是“text/plain”

因此，这意味着通过这两个更改，您会得到这个有效的 MIME 消息：

From: [e-mail]
To: [e-mail]
Subject: Test Email
Content-Type: multipart/mixed;
  boundary="_003_97DCB304C5294779BEBCFC8357FCC4D2"
MIME-Version: 1.0

--_003_97DCB304C5294779BEBCFC8357FCC4D2
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Hello, This is a test email.

--_003_97DCB304C5294779BEBCFC8357FCC4D2
Content-Type: text/plain; name="test.txt"
Content-Description: test.txt
Content-Disposition: attachment; filename="test.txt";
Content-Transfer-Encoding: base64

VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudC4=

【参考方案1】：

MIME 文件存在两个问题。首先

尾随边界不应该在那里，因为它显然是在寻找 MIME 消息的另一个方面，例如另一个附件。

定义为“text/txt”的Content-Type实际上应该是“text/plain”

因此，通过这两个更改，您会得到这个有效的 MIME 消息：

From: [e-mail]
To: [e-mail]
Subject: Test Email
Content-Type: multipart/mixed;
  boundary="_003_97DCB304C5294779BEBCFC8357FCC4D2"
MIME-Version: 1.0

--_003_97DCB304C5294779BEBCFC8357FCC4D2
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Hello, This is a test email.

--_003_97DCB304C5294779BEBCFC8357FCC4D2
Content-Type: text/plain; name="test.txt"
Content-Description: test.txt
Content-Disposition: attachment; filename="test.txt";
Content-Transfer-Encoding: base64

VGhpcyBpcyBhIHRlc3QgYXR0YWNobWVudC4=