m := email.NewMessage("Hi", "this is the body")
m.From = mail.Address{Name: "From", Address: "ex@gmail.com"}
m.To = []string{"exxx@gmail.com"}

// add attachments
if err := m.Attach("pictures.png"); err != nil {
    log.Fatal(err)
}

// send it
auth := smtp.PlainAuth("", "ex@gmail.com", "Mob2221", "smtp.gmail.com")
if err := email.Send("smtp.gmail.com:587", auth, m); err != nil {
    log.Fatal(err)
}