simplegmail.go

package main

import (
	"bytes"
	"log"
	"net/smtp"
	"text/template"
)

func main() {
	sendGmail("sender@domain.com", "<passwd>", "recipient@domain.com",
		"This is an example subject",
		"This is an example body",
	)
}

func sendGmail(user, pass, recipient, subject, body string) {
	data := &SmtpTemplateData{
		user,
		recipient,
		subject,
		body,
	}

	var doc bytes.Buffer
	t, err := template.New("_").Parse(emailTemplate)
	if err != nil {
		log.Print("error trying to parse mail template")
	}
	err = t.Execute(&doc, data)
	if err != nil {
		log.Print("error trying to execute mail template")
	}
	err = smtp.SendMail("smtp.gmail.com:587",
		smtp.PlainAuth("", user, pass, "smtp.gmail.com"),
		user,
		[]string{recipient},
		doc.Bytes(),
	)

	if err != nil {
		log.Printf("smtp error: %s", err)
		return
	}
}

type SmtpTemplateData struct {
	From    string
	To      string
	Subject string
	Body    string
}

const emailTemplate = `From: {{ .From }};
To: {{ .To }};
Subject: {{ .Subject }}

{{ .Body }}

Sincerely,

{{ .From }}
`