Wail

• Overview
• Installation
• Usage
  • Step #1. Creating a SMTP config
  • Step #2. Creating a client and establishing a connection
  • Step #3. Creating an email
  • Step #4. Creating a message
  • Step #5. Sending the email
• License

Overview

Wail is a simple package to send emails. It supports:

• SSL/TLS encryption
• Base64 and quoted printable encoding
• Authentication on server
• Plain text and HTML messages
• Attachments

Installation

To install the package run the following command:

go get -u github.com/rub1q/wail

Usage

Step #1. Creating a SMTP config

First things first you need to define a SMTP config. For example as follows:

cfg := &wail.SmtpConfig{
  Server: wail.ServerConfig{
    Host:           "smtp.example.com",
    Port:           465,
    NeedAuth:       true,
    ConnectTimeout: 10 * time.Second,
    EncryptType:    wail.EncryptSSL,
  },
  Sender: wail.SenderConfig{
    Name:     "Alex",
    Login:    os.Getenv("SENDER_LOGIN"),
    Password: os.Getenv("SENDER_PWD"),
  },
  TlsConfig: &tls.Config{
    InsecureSkipVerify: true,
  },
}

A few words about config

By default is using EncryptType = EncryptSSL. If the SMTP server supports a STARTTLS extension you can change the EncryptType value to EncryptTLS

The sender's Name is using to show it above your emails. If you do not need an authentication set the NeedAuth to false. Hence, the sender's Login and Password could be omitted

TlsConfig is using to specify additional setting for establishing encrypted connection with the SMTP server

Note: leave the default TlsConfig value if you do not know how to use it

Step #2. Creating a client and establishing a connection

After the config is done you need to create a new client. Call NewClient() and pass it your config:

c := wail.NewClient(cfg)

Then call Dial() to establish a connection with the server. Dial() could return an error if something go wrong

err := c.Dial()
if err != nil {
  log.Fatal(err.Error())
}

defer c.Close()

Step #3. Creating an email

The next step is creating an email object. Call the NewMail() method to do it

mailCfg := &wail.MailConfig{
  Charset:  wail.UTF8,
  Encoding: wail.Base64,
}

mail := wail.NewMail(mailCfg)

NewMail() is accepting MailConfig structure as a parameter. You can pass nil if you want to use a default config values

Call SetSubject() to set the email subject:

mail.SetSubject("Test subject")

Then specify all recipients by using To(), CopyTo() and BlindCopyTo() methods. For example:

err = mail.To("example1@example.com", "example2@example.com")
if err != nil {
  log.Fatal(err.Error())
}

err = mail.CopyTo("example3@example.com")
if err != nil {
  log.Fatal(err.Error())
}

All three methods could return an error

Step #4. Creating a message

At the momemt Wail supports 4 message Content-Types:

• text/plain
• text/html
• multipart/mixed
• multipart/alternative

For each Content-Type methods and structures are provided

Assume you want to send a text\plain message. Call the NewTextMessage() method:

mt := wail.NewTextMessage()

And then provide a text you want to send:

mt.Set(wail.TextPlain, []byte("Hello, World"))

Set() accepts TextPlain or TextHtml as the first parameter. Use the last one if you need to send a HTML message

Step #5. Sending the email

After you have created the message call SetMessage() and pass it your message object.

mail.SetMessage(&mt)

Finally, call Send() with an email object argument to send an email:

err = c.Send(mail)
if err != nil {
  log.Fatal(err.Error())
}

License

MIT License