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Programming language: Go
Tags: Email    
Latest version: v2.3.0

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README

Go Simple Mail

The best way to send emails in Go with SMTP Keep Alive and Timeout for Connect and Send.

Go Doc Go Report

IMPORTANT This example is for version 2.2.0 and above.

Version 2.1.3 and below use "text/html" and "text/plain" in SetBody and AddAlternative Also 2.0.0 and below go to this doc https://gist.github.com/xhit/54516917473420a8db1b6fff68a21c99

Introduction

Go Simple Mail is a simple and efficient package to send emails. It is well tested and documented.

Go Simple Mail can only send emails using an SMTP server. But the API is flexible and it is easy to implement other methods for sending emails using a local Postfix, an API, etc.

Features

Go Simple Mail supports:

  • Multiple Attachments with path
  • Multiple Attachments in base64
  • Multiple Recipients
  • Priority
  • Reply to
  • Set other sender
  • Set other from
  • Embedded images
  • HTML and text templates
  • Automatic encoding of special characters
  • SSL and TLS
  • Unencrypted connection (not recommended)
  • Sending multiple emails with the same SMTP connection (Keep Alive or Persistent Connection)
  • Timeout for connect to a SMTP Server
  • Timeout for send an email
  • Return Path
  • Alternaive Email Body
  • CC and BCC
  • Add Custom Headers in Message
  • Send NOOP, RESET, QUIT and CLOSE to SMTP client
  • PLAIN, LOGIN and CRAM-MD5 Authentication ( >= v2.3.0)

Documentation

https://godoc.org/github.com/xhit/go-simple-mail

Download

go get -u github.com/xhit/go-simple-mail

Usage

package main

import (
    "github.com/xhit/go-simple-mail"
    "log"
)

func main() {

    htmlBody :=
`<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>Hello Gophers!</title>
    </head>
    <body>
        <p>This is the <b>Go gopher</b>.</p>
        <p><img src="cid:Gopher.png" alt="Go gopher" /></p>
        <p>Image created by Renee French</p>
    </body>
</html>`

    server := mail.NewSMTPClient()

    //SMTP Server
    server.Host = "smtp.example.com"
    server.Port = 587
    server.Username = "test@example.com"
    server.Password = "examplepass"
    server.Encryption = mail.EncryptionTLS

    /*
    In version >=2.3.0 you can specified authentication type: PLAIN, LOGIN, CRAM-MD5
    if not specified, default is mail.AuthPlain

    code:
    server.Authentication = mail.AuthPlain
    */

    //Variable to keep alive connection
    server.KeepAlive = false

    //Timeout for connect to SMTP Server
    server.ConnectTimeout = 10 * time.Second

    //Timeout for send the data and wait respond
    server.SendTimeout = 10 * time.Second

    //SMTP client
    smtpClient,err :=server.Connect()

    if err != nil{
        log.Fatal(err)
    }

    //New email simple html with inline and CC
    email := mail.NewMSG()

    email.SetFrom("From Example <nube@example.com>").
        AddTo("xhit@example.com").
        AddCc("otherto@example.com").
        SetSubject("New Go Email")

    email.SetBody(mail.TextHTML, htmlBody)

    email.AddInline("/path/to/image.png", "Gopher.png")

    //Call Send and pass the client
    err = email.Send(smtpClient)

    if err != nil {
        log.Println(err)
    } else {
        log.Println("Email Sent")
    }
}

Send multiple emails in same connection

    //Set your smtpClient struct to keep alive connection
    server.KeepAlive = true

    toList := [3]string{"to1@example1.com", "to3@example2.com", "to4@example3.com"}

    for _, to := range toList {
        //New email simple html with inline and CC
        email := mail.NewMSG()

        email.SetFrom("From Example <nube@example.com>").
            AddTo(to).
            SetSubject("New Go Email")

        email.SetBody(mail.TextHTML, htmlBody)

        email.AddInline("/path/to/image.png", "Gopher.png")

        //Call Send and pass the client
        err = email.Send(smtpClient)

        if err != nil {
            log.Println(err)
        } else {
            log.Println("Email Sent")
        }
    }