mimetext

MIMEText

RFC-2822, RFC-2045 and RFC-2049 compliant raw email message generator. Refer to https://muratgozel.github.io/MIMEText/ for full api docs.

It has full typings. Optimized to run on node, browser and google apps script environments. Compatible with commonjs and esm.

Install

npm i mimetext

There is special version for Google Apps Script environment which can be found under dist folder: ./dist/gas.js or ./dist/gas.cjs

Use

Import the appropriate version for your environment. Use mimetext/browser for browser and mimetext for node environments.

// es
import {createMimeMessage} from 'mimetext'
// or const {createMimeMessage} = require('mimetext') for commonjs

// create a simple plain text email
const msg = createMimeMessage()
msg.setSender({name: 'Lorem Ipsum', addr: '[e-mail]'})
msg.setRecipient('[e-mail]')
msg.setSubject('🚀 Issue 49!')
msg.addMessage({
    contentType: 'text/plain',
    data: `Hi,
I'm a simple text.`
})
const raw = msg.asRaw()
/*
Date: Sun, 24 Oct 2021 04:50:32 +0000
From: "Lorem Ipsum" <[e-mail]>
To: <[e-mail]>
Message-ID: <[e-mail]>
Subject: =?utf-8?B?8J+agCBJc3N1ZSA0OSE=?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8

Hi,
I'm a simple text.
*/

Different Ways Of Adding Recipients

There are more than one method and format to add recipients:

// adds recipient to To field by default
msg.setRecipient('Firstname Lastname <[e-mail]>')
// you can specify To, Cc, Bcc
msg.setRecipient('Firstname Lastname <[e-mail]>', {type: 'Cc'})
// as object, only addr is required
msg.setRecipient({addr: '[e-mail]', name: 'Firstname Lastname', type: 'Bcc'})
// shortcut methods
msg.setTo('[e-mail]')
msg.setCc('[e-mail]')
msg.setBcc('[e-mail]')
// multiple recipient at once
msg.setRecipients('[e-mail]', 'Firstname Lastname <[e-mail]>', {addr: '[e-mail]'})

// similarly you can set the sender
msg.setSender('First Last <[e-mail]>')
msg.setSender({name: 'First Last', addr: '[e-mail]'})

HTML Message With Plain Text Fallback And Attachments

You can set html and plain text messages both and recipients mail client will render however they think appropriate.

The example below demonstrates more sophisticated email content including inline attachments and regular attachments.

const msg = createMimeMessage()
msg.setSender('[e-mail]')
msg.setRecipients('[e-mail]')
msg.setSubject('Testing MimeText 🐬 (Plain Text + HTML With Mixed Attachments)')
msg.addMessage({
    contentType: 'text/plain',
    data: 'Hello there,' + EOL + EOL +
        'This is a test email sent by MimeText test suite.'
})
// specify inline attachment's content id inside img src tag. <img src="cid:[ID]">
msg.addMessage({
    contentType: 'text/html',
    data: 'Hello there,<br><br>' +
        'This is a test email sent by <b>MimeText</b> test suite.<br><br>' +
        'The term MimeText above supposed to be bold. Are you able to see it?<br><br>' +
        'Below, there should be a small image that contains little black dots:<br><br>' +
        '<img src="cid:dots123456"><br><br>' +
        'Best regards.'
})
msg.addAttachment({
    filename: 'sample.jpg',
    contentType: 'image/jpg',
    data: '...base64 encoded data...'
})
msg.addAttachment({
    filename: 'sample.txt',
    contentType: 'text/plain',
    data: '...base64 encoded data...'
})
// this is inline attachment!
msg.addAttachment({
    inline: true,
    filename: 'dots.jpg',
    contentType: 'image/jpg',
    data: '...base64 encoded data...',
    headers: {'Content-ID': 'dots123456'}
})
const raw = msg.asRaw()
/*
Date: Sun, 26 Mar 2023 13:27:15 +0000
From: <[e-mail]>
To: <[e-mail]>
Message-ID: <[e-mail]>
Subject: =?utf-8?B?VGVzdGluZyBNaW1lVGV4dCDwn5CsIChQbGFpbiBUZXh0ICsgSFRNTCBXaXRoIE1peGVkIEF0dGFjaG1lbnRzKQ==?=
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=giev1zqo579

--giev1zqo579
Content-Type: multipart/related; boundary=hl6rtnn5jq

--hl6rtnn5jq
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 7bit

Hello there,<br><br>This is a test email sent by <b>MimeText</b> test suite.<br><br>The term MimeText above supposed to be bold. Are you able to see it?<br><br>Below, there should be a small image that contains little black dots:<br><br><img src="cid:dots123456"><br><br>Best regards.

--hl6rtnn5jq
Content-ID: <dots123456>
Content-Type: image/jpg; name="dots.jpg"
Content-Transfer-Encoding: base64
Content-Disposition: inline; filename="dots.jpg"

/9j/4AAQSkZJRgABAgEASABIAAD/2wCEAAEBAQEBAQEBAQEBAQEBAQ...........BPwAp/9k=
--hl6rtnn5jq--
--giev1zqo579
Content-Type: image/jpg; name="sample.jpg"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="sample.jpg"

/9j/4AAQSkZJRgABAg...........befPb4N8Hn4A/9k=

--giev1zqo579
Content-Type: text/plain; name="sample.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="sample.txt"

SGVsbG8gdGhlcmUu
--giev1zqo579--
*/

Encoding The Output

If you ever need to get base64-websafe encoded version of the raw data, you can use asEncoded() method.

// it first gets the raw version and then encodes it.
msg.asEncoded()

Use Cases

MIMEText is useful for email sending platforms and end-user apps whose email clients require raw email messages.

Below you can find some examples for Amazon SES or Google Gmail.

Amazon SES with AWS-SDK

ses client v1:

// install with npm i @aws-sdk/client-ses

// init aws sdk
const { SESClient, SendRawEmailCommand } = require('@aws-sdk/client-ses')
const ses = new SESClient({ region: 'YOUR_REGION' })
const { Buffer } = require('node:buffer')

// init mimetext
const { createMimeMessage } = require('mimetext')
const message = createMimeMessage()

// create email message
message.setSender('[e-mail]')
message.setTo('[e-mail]')
message.setSubject('Weekly Newsletter 49 Ready 🚀')
message.addAttachment({
  filename: 'bill.pdf',
  contentType: 'application/pdf',
  data: '...base64 encoded data...'
})
message.addMessage({
  contentType: 'text/html',
  data: 'Hello <b>John</b>.'
})

// send email with aws sdk
const params = {
  Destinations: message.getRecipients({type: 'to'}).map(mailbox => mailbox.addr),
  RawMessage: {
    Data: Buffer.from(message.asRaw(), 'utf8') // the raw message data needs to be sent as uint8array
  },
  Source: message.getSender().addr
}
const result = await ses.send(new SendRawEmailCommand(params))
// result.MessageId

ses client v2:

// install with npm i @aws-sdk/client-sesv2

// init aws sdk
const { SESv2Client, SendEmailCommand } = require('@aws-sdk/client-ses')
const ses = new SESv2Client({ region: 'YOUR_REGION' })
const { Buffer } = require('node:buffer')

// init mimetext
const { createMimeMessage } = require('mimetext')
const message = createMimeMessage()

// create email message
message.setSender('[e-mail]')
message.setTo('[e-mail]')
message.setSubject('Weekly Newsletter 49 Ready 🚀')
message.addAttachment({
    filename: 'bill.pdf',
    contentType: 'application/pdf',
    data: '...base64 encoded data...'
})
message.addMessage({
    contentType: 'text/html',
    data: 'Hello <b>John</b>.'
})

const params = {
    FromEmailAddress: message.getSender().addr,
    Destination: {
        ToAddresses: message.getRecipients().map((box) => box.addr)
    },
    Content: {
        Raw: {
            Data: Buffer.from(message.asRaw(), 'utf8')
        }
    }
}
const result = await ses.send(new SendEmailCommand(params))
// result.MessageId

Google Gmail with googleapis-sdk

// init google api sdk
const {google} = require('googleapis')

// create email message
const {createMimeMessage} = require('mimetext')
const message = createMimeMessage()
message.setSender('[e-mail]')
message.setTo('[e-mail]')
message.setSubject('Weekly Newsletter 49 Ready 🚀')
message.addAttachment({
    filename: 'bill.pdf',
    contentType: 'application/pdf',
    data: '...base64 encoded data...'
})
message.addMessage({
    contentType: 'text/html',
    data: 'Hello <b>John</b>.'
})

// send email
google.auth
  .getClient({scopes: ['https://www.googleapis.com/auth/gmail.send']})
  .then(function(client) {
    client.subject = '[e-mail]'

    const gmail = google.gmail({ version: 'v1', auth: client })

    gmail.users.messages
      .send({
        userId: 'me',
        requestBody: {
          raw: message.asEncoded()
        }
      })
      .then(function(result) {
        // result.id
      })
      .catch(function(err) {

      })
  })

Error Handling

Most of the methods raises MIMETextError in case of invalid input. You can catch them and handle them accordingly.

try {
  message.setTo({prop: 'invalid'})
} catch (e) {
  e instanceof MIMETextError === true
}

Contributing

If you're interested in contributing, read the CONTRIBUTING.md first, please.

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