背景介绍
SMTP协议
SMTP(Simple Mail Transfer Protocol)：简单邮件传送协议
- STMP端口号为25, 使用TCP建立连接.
- SMTP限于传送7位的ASCII码
MIME协议
MIME (Multipurpose Internet Mail Extension)
flowchart LR
A1[user1] <-- 不止7位ASCII码 --> B1[MIME]
B1 <-- 7位ASCII码 --> C1[SMTP]
C1 <-- 7位ASCII码 --> C2[SMTP]
C2 <-- 7位ASCII码 --> B2[MIME]
B2 <-- 不止7位ASCII码 --> A2[user2]
前置条件
- 首先要有一个AWS的账户，并且SES服务可以正常使用。
- 在SES服务中，提前verified 要使用的email
Overview
SES的三种发送邮件的方式
SES本身有三种发送邮件的方式，如下图所示：
flowchart LR
SES --> B1["1. 直接发送邮件内容"]
SES --> B2["2. 发送邮件内容和附件，包括但不限于 txt,csv,pdf,image..."]
SES --> B3["3. 使用template发送邮件"]
在这里，我们主要讨论的是带附件的邮件的发送。
SES V1 和 V2 对于附件大小的限制
| ses v1 | ses v2 | |
|---|---|---|
| 附件大小的限制 | 10M | 40M |
附件类型的定义
- Content-Type: application/octet-stream ===>
attachment.pdf - Content-Type: application/json ===>
attachment.json - Content-Type: application/msword ===>
attachment.docx - Content-Type: text/plain ===>
attachment.txt
方法一: 使用AWS SES V1版本发送邮件和附件
使用 ses v1 发送邮件和附件，附件的限制大小是 10M.
1. 定义 payload
- 使用
boundary来分割大文件部分 boundary可以级联sub boundary
js
// define file
let file = fs.readFileSync('./src/util/testData.csv',
{encoding:'base64', flag:'r'}
);
// define payload
const payload = `From: ${email}
To: ${email}
Subject: Customer service contact info
Content-Type: multipart/mixed;
boundary="a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a"
--a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: multipart/alternative;
boundary="sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a"
--sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
Please see the attached file for a list of customers to contact.
--sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
<html>
<head></head>
<body>
<h1>Hello!</h1>
<p>Please see the attached file for a list of customers to contact.</p>
</body>
</html>
--sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a--
--a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: text/plain; name="attachment.csv"
Content-Description: attachment.csv
Content-Disposition: attachment;filename="attachment.csv";
creation-date="Sat, 05 Aug 2017 19:35:36 GMT";
Content-Transfer-Encoding: base64
${file}
--a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a--
`;2.发送邮件
js
import * as AWS from "@aws-sdk/client-ses";
import fs from "fs";
const client = new AWS.SES();
const email = "test@test.com.cn";
(async () => {
const params = {
RawMessage: {
Data: Buffer.from(payload)
},
Source: email,
Destinations: [],
};
try {
return await client.sendRawEmail(params);
} catch (e) {
console.error(e);
console.error("Failed to send email.");
return e;
}
})();方法二: 使用AWS SES V2版本发送邮件和附件
使用 ses v2 发送邮件和附件，附件的限制大小是 40M.
实现代码
js
import fs from "fs";
import { SESv2Client, SendEmailCommand } from "@aws-sdk/client-sesv2"
const client = new SESv2Client();
const email = "test@test.com.cn";
let file = fs.readFileSync('./src/util/testData.csv',
{encoding:'base64', flag:'r'}
);
const payload = `From: ${email}
To: ${email}
Subject: Customer service contact info
Content-Type: multipart/mixed;
boundary="a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a"
--a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: multipart/alternative;
boundary="sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a"
--sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
Please see the attached file for a list of customers to contact.
--sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
<html>
<head></head>
<body>
<h1>Hello!</h1>
<p>Please see the attached file for a list of customers to contact.</p>
</body>
</html>
--sub_a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a--
--a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a
Content-Type: text/plain; name="attachment.csv"
Content-Description: attachment.csv
Content-Disposition: attachment;filename="attachment.csv";
creation-date="Sat, 05 Aug 2017 19:35:36 GMT";
Content-Transfer-Encoding: base64
${file}
--a3f166a86b56ff6c37755292d690675717ea3cd9de81228ec2b76ed4a15d6d1a--
`;
(async () => {
const command = new SendEmailCommand({
Content: {
Raw: {
Data: Buffer.from(payload)
}
},
Destination: {
ToAddresses: [email],
},
});
try {
return await client.send(command);
} catch (e) {
console.error(e);
console.error("Failed to send email.");
return e;
}
})();