Send email using Go (Golang) via GMail with net/smtp

smtp-gmail-send.go

package main

import (
	"log"
	"net/smtp"
)

func main() {
	send("hello there")
}

func send(body string) {
	from := "...@gmail.com"
	pass := "..."
	to := "foobarbazz@mailinator.com"

	msg := "From: " + from + "\n" +
		"To: " + to + "\n" +
		"Subject: Hello there\n\n" +
		body

	err := smtp.SendMail("smtp.gmail.com:587",
		smtp.PlainAuth("", from, pass, "smtp.gmail.com"),
		from, []string{to}, []byte(msg))

	if err != nil {
		log.Printf("smtp error: %s", err)
		return
	}
	
	log.Print("sent, visit http://foobarbazz.mailinator.com")
}

Hi @luizuatanabe. The same thing happens to me. Due to Google's policy change in May 2022, it is now no longer possible to disable the "less secure apps" option. Do you know if there is a way to perform this validation to send emails?

@parkare same thing here. Did you figure out a solution?

The "less secure apps" is available for google enterprise accounts.

https://gist.github.com/jpillora/cb46d183eca0710d909a?permalink_comment_id=3519541#gistcomment-3519541

This worked! Instead of password generate a app password and use it as password. Works like charm!!

upd: this work for me, need add parametr from in msg object
msg := []byte("From: ***@mail.com\r\n" +
"To: ***@gmail.com\r\n" +
"Subject: New Hack\r\n" +
"\r\n" +
"Wonderful solution\r\n")

FYI here's a link to the app passwords: https://myaccount.google.com/apppasswords