smtppool

smtppool is a Go library that creates a pool of reusable SMTP connections for high throughput e-mailing. It gracefully handles idle connections, timeouts, and retries. The e-mail formatting, parsing, and preparation code is forked from jordan-wright/email.

Install

go get github.com/knadh/smtppool/v2

Usage

package main

import (
"log"
"time"

"github.com/knadh/smtppool/v2"
)

func main() {
// Try https://github.com/mailhog/MailHog for running a local dummy SMTP server.
// Create a new pool.
pool, err := smtppool.New(smtppool.Opt{
Host:            "localhost",
Port:            1025,
MaxConns:        10,
IdleTimeout:     time.Second * 10,
PoolWaitTimeout: time.Second * 3,
SSL:             smtppool.SSLNone
})
if err != nil {
log.Fatalf("error creating pool: %v", err)
}

e:= smtppool.Email{
From:    "John Doe <john@example.com>",
To:      []string{"doe@example.com"},

// Optional.
Bcc:     []string{"doebcc@example.com"},
Cc:      []string{"doecc@example.com"},

Subject: "Hello, World",
Text:    []byte("This is a test e-mail"),
HTML:    []byte("<strong>This is a test e-mail</strong>"),
}

// Add attachments.
if _, err := e.AttachFile("test.txt"); err != nil {
log.Fatalf("error attaching file: %v", err)
}

if err := pool.Send(e); err != nil {
log.Fatalf("error sending e-mail: %v", err)
}
}

Licensed under the MIT license.