send_attachment_mail.go

package main

import (
	"crypto/tls"
	"image/png"
	"os"

	"github.com/kbinani/screenshot"
	"gopkg.in/gomail.v2"
)

func main() {
	//Create Screenshot File
	n := screenshot.NumActiveDisplays()
	for i := 0; i < n; i++ {
		bounds := screenshot.GetDisplayBounds(i)

		img, err := screenshot.CaptureRect(bounds)
		if err != nil {
			panic(err)
		}
		file, _ := os.Create("screenshot.png")
		defer file.Close()
		png.Encode(file, img)
	}
	//Send Mail
	m := gomail.NewMessage()
	m.SetHeader("From", "<mail-addr>")
	m.SetHeader("To", "<mail-addr>")
	m.SetHeader("Subject", "Have a screenshot!")
	m.SetBody("text/html", "Hello <b>X</b> <i>X</i>")
	m.Attach("screenshot.png")

	d := gomail.NewPlainDialer("smtp.gmail.com", 587, "<mail-addr>", "<password>")
	d.TLSConfig = &tls.Config{InsecureSkipVerify: true}
	if err := d.DialAndSend(m); err != nil {
		panic(err)
	}
}