package main

import (
    "log"
    "net/smtp"
)

var (
    host string
    port string
    login string
    password string
)

func SendMail() {
    auth := smtp.PlainAuth("", login, password, host)
    to := []string{"...@yandex.ru"}
    msg := []byte(
        "From: " + login + "\n" +
        "To: ...@yandex.ru\r\n" +
        "Subject: Try_0\r\n" +
        "\r\n" +
        "This is the email body, version_0.\r\n")
    err := smtp.SendMail(host + ":" + port, auth, login, to, msg)
    if err != nil {
        log.Fatal(err)
    }
}

func main() {
    host = "smtp.yandex.ru"
    port = "465"
    login = "...@yandex.ru"
    password = "..."
    SendMail()
}