如何使用 NodeJS 将多个文件作为附件附加到 AWS SES 中的 MIME 文本？

Question

我正在使用 AWS SES 发送带附件的电子邮件，由于 sendEmail 函数目前无法发送附件，因此我在 SES 中使用 sendRawEmail 函数。为了发送原始电子邮件，我已将电子邮件转换为 MIME 文本，如下所示。它有两个附件（图像转换为 base64）、一个正文和一些标题。

From: [email protected]
To: [email protected]
Cc: 
Bcc: 
Subject: Test from Lambda
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="----=_Part2904462804807624"


------=_Part2904462804807624
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit


Hello world


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Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 7bit


<h1>Hello</h1><p>world</p>


------=_Part2904462804807624
Content-Type: image/jpeg; name="sea-surface-turquoise-blue-color-background-some-reflections-calm-crystal-clear-water-small-ripples-sea-surface-turquoise-221064440.jpg"
Content-Description: sea-surface-turquoise-blue-color-background-some-reflections-calm-crystal-clear-water-small-ripples-sea-surface-turquoise-221064440.jpg
Content-Disposition: attachment;filename="sea-surface-turquoise-blue-color-background-some-reflections-calm-crystal-clear-water-small-ripples-sea-surface-turquoise-221064440.jpg";
Content-Transfer-Encoding: base64


/9j/4AAQSkZJRgABAQAAAQABAAD/4gIcSUNDX1BST0ZJTEUAAQEAAAIMbGNtcwIQAABtbnRyUkdCIFhZWiAH3AABABkAAwApADlhY3NwQVBQTAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA9tYAAQAAAADTLWxjbXMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAApkZXNjAAAA/
.....................................
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.....................................
MOO3FwVjiwfsg1fcci0NRnULhYioZ2KOJRlg33mWBSNrslR+COggrOdzIshEqj4ghEN3WU6jhDlg8zDHGYoRsMNKcauLzWjjzBY26eC5ZFlpeI0fITV8EdMstRZcj4mTDEpYYeTuUa1+yBUdHBcs8rdahAOUiCgJLUZEn/9k=


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Content-Type: image/jpeg; name="image.desktop.size-xl.sme-greenoption-xl1280x720.jpeg"
Content-Description: image.desktop.size-xl.sme-greenoption-xl1280x720.jpeg
Content-Disposition: attachment;filename="image.desktop.size-xl.sme-greenoption-xl1280x720.jpeg";
Content-Transfer-Encoding: base64


/9j/4AAQSkZJRgABAgAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCALQBQADASIAAhEBAxEB/
.....................................
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.....................................
ojzPGee6OP61rQa14b06zmutOtLmw1KJSsSTpvILcZV+gx7it/wJaNeeEbqGWK2uIgSttHKoIRwD8p7gZx/Sli023sNae2j0mzS9njKkGcm3kTA3ADdlST6qc150q1HmdNrbs/0Dof/2Q==


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我删除了一部分 base64 编码，因为它太长了。此 MIME 文本与 SES 配合良好，但仅附加第一个文件。第二个文件未附加到电子邮件中。我已经单独测试了第二个文件，它工作正常。 MIME 文本可能有什么问题？

Answer 1

找到了这个问题的原因。在 MIME 文本中，最终边界应以双破折号 -- 结尾。但就我而言，我使用双破折号来分隔两个附件，这导致 MIME 文本多部分边界结束而没有最终附件。以下是更正后的 MIME 文本，用于添加多个附件。

From: [email protected]
To: [email protected]
Cc: 
Bcc: 
Subject: Test from Lambda
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="----=_Part2904462804807624"


------=_Part2904462804807624
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit


Hello world


------=_Part2904462804807624
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 7bit


<h1>Hello</h1><p>world</p>


------=_Part2904462804807624
Content-Type: image/jpeg; name="sea-surface-turquoise-blue-color-background-some-reflections-calm-crystal-clear-water-small-ripples-sea-surface-turquoise-221064440.jpg"
Content-Description: sea-surface-turquoise-blue-color-background-some-reflections-calm-crystal-clear-water-small-ripples-sea-surface-turquoise-221064440.jpg
Content-Disposition: attachment;filename="sea-surface-turquoise-blue-color-background-some-reflections-calm-crystal-clear-water-small-ripples-sea-surface-turquoise-221064440.jpg";
Content-Transfer-Encoding: base64


/9j/4AAQSkZJRgABAQAAAQABAAD/4gIcSUNDX1BST0ZJTEUAAQEAAAIMbGNtcwIQAABtbnRyUkdCIFhZWiAH3AABABkAAwApADlhY3NwQVBQTAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA9tYAAQAAAADTLWxjbXMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAApkZXNjAAAA/
.....................................
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.....................................
MOO3FwVjiwfsg1fcci0NRnULhYioZ2KOJRlg33mWBSNrslR+COggrOdzIshEqj4ghEN3WU6jhDlg8zDHGYoRsMNKcauLzWjjzBY26eC5ZFlpeI0fITV8EdMstRZcj4mTDEpYYeTuUa1+yBUdHBcs8rdahAOUiCgJLUZEn/9k=


------=_Part2904462804807624
Content-Type: image/jpeg; name="image.desktop.size-xl.sme-greenoption-xl1280x720.jpeg"
Content-Description: image.desktop.size-xl.sme-greenoption-xl1280x720.jpeg
Content-Disposition: attachment;filename="image.desktop.size-xl.sme-greenoption-xl1280x720.jpeg";
Content-Transfer-Encoding: base64


/9j/4AAQSkZJRgABAgAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCALQBQADASIAAhEBAxEB/
.....................................
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.....................................
ojzPGee6OP61rQa14b06zmutOtLmw1KJSsSTpvILcZV+gx7it/wJaNeeEbqGWK2uIgSttHKoIRwD8p7gZx/Sli023sNae2j0mzS9njKkGcm3kTA3ADdlST6qc150q1HmdNrbs/0Dof/2Q==


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