How to create and send MIME-encoded email messages in Go?

To create and send MIME-encoded email messages in Go, you can make use of the built-in net/smtp package along with the github.com/jordan-wright/email package.

Here's an example code snippet that demonstrates how to create and send a MIME-encoded email in Go:

package main

import (
	"log"
	"net/smtp"

	"github.com/jordan-wright/email"
)

func main() {
	// Create a new email message
	m := email.NewEmail()

	// Set the sender and recipient
	m.From = "[email protected]"
	m.To = []string{"[email protected]"}

	// Set the subject
	m.Subject = "Hello, MIME!"

	// Set the email body as MIME-encoded HTML content
	m.HTML = []byte(`
		<html>
		<body>
			<h1>Email Content</h1>
			<p>This is a <strong>MIME-encoded</strong> email.</p>
		</body>
		</html>
	`)

	// Attach a file if needed
	err := m.AttachFile("path/to/file.txt")
	if err != nil {
		log.Fatal(err)
	}

	// Connect to the SMTP server
	smtpAddr := "smtp.example.com:587"
	auth := smtp.PlainAuth("", "username", "password", "smtp.example.com")
	err = m.Send(smtpAddr, auth)
	if err != nil {
		log.Fatal(err)
	}

	log.Println("Email sent successfully!")
}

Make sure to replace the placeholder values with your actual email addresses, SMTP server details, and authentication credentials.

To run this code, you need to have the github.com/jordan-wright/email package installed. You can install it using the following command:

go get github.com/jordan-wright/email

Once installed, you can run your Go program using the go run command:

go run filename.go

This should create and send a MIME-encoded email with an HTML content and an optional attachment.