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Best Ruby Gems for Email Sending

Every Rubyist will tell you that the basic way to send email with Ruby is to use the Net::SMTP class. Also, he or she will add that you shouldn’t go this way. Why? Because there are a few notable gems that let you handle email activities simply and effectively. And today we’ll check out the most popular ones including Action Mailer, Ruby Mail, and Pony.


This is the most popular gem if you need to give effect to email delivery on a Ruby on Rails app. It lets you send emails using mailer classes and views. Here’s how a simple email built with ActionMailer may look:

class TestMailer < ActionMailer::Base
  default from: ''
  def simple_message(recipient)
      subject: 'Subject of the message',
      body: 'Body text of the message'

How to create and send an email with ActionMailer?

It’s unlikely that you’ll be OK with a simple message. In most cases, your Ruby app will send transactional emails and they need to be refined. So, check out the following guide on how to create an advanced message and send it using the SMTP server.

  1. Start with creating a mailer model because your app will use it to send emails:

    Also, you need helpers to generate an electronic message. They are defined in the mailer model. You can set up variables in the mailer views, options like :to address, and so on. Here are some helpers you can make use of:

    • attachments['filename.png'] ='path/to/attachment.pdf') – to add attachments
    • attachments.inline['filename.png'] ='path/to/attachment.pdf') – to add an inline attachment
    • headers['X-No-Spam'] = 'True' – to specify a header field
    • headers({'X-No-Spam' => 'True', 'In-Reply-To' => ''}) – to specify multiple headers
    • mail – to specify the email to be sent

    Here is what we’ve got:

    In this mailer class, we’ve got HTML text, as well as an attached PNG file. Now, we can create a corresponding view.


Ruby Mail

Now, let’s check out how to manage all email-related activities using Ruby Mail. And we’ll start with a code example of a simple email:

mail = do
  from    ''
  to      ''
  subject 'Subject of the message'
  body    'Body text'

SMTP is a default mail delivery method with a local host port 25. But you can customize the SMTP settings:

Mail.defaults do
  delivery_method :smtp, address: "localhost", port: 1025

and change the delivery method:

mail.delivery_method :sendmail


How to send an HTML email with attachment in Ruby Mail?

We already know how to send multi-part emails with ActionMailer. Now, let’s see how to do this in Ruby Mail:

mail = do
  from    ''
  to      ''
  subject 'Subject of the message'
  text_part do
    body 'Body text'
  html_part do
    content_type 'text/html; charset=UTF-8'
    body '<h2>HTML text</h2>'

  add_file '/path/to/file.png'

Quite simple, isn’t it? And there is more to come. The next Ruby gem lets you send an email in one command.


It’s not a fairy tale and you really can use one command to send messages. And here is the example:

Pony.mail(:to => '', :from => '', :subject => 'Subject of the message', :body => 'Body text'

If necessary, the script can be cut to having only :to option key. Also, you can specify a delivery method:

Pony.mail(:to => '', :via => :smtp) 


Pony.mail(:to => '', :via => :sendmail)

And that’s how the SMTP server configuration looks like. We’ll take Gmail SMTP as an example:

Pony.mail(:to => '', :via => :smtp, :via_options => {
  :address        => '',
  :port           => '587',
  :user_name      => 'user',
  :password       => 'pass',
  :authentication => :plain,
  :domain         => ""

Authorization options include Plain, Login, and Cram_MD5. By default, no authorization is set. 

Unfortunately, Pony won’t let you send a message containing the HTML text or attached with a file.

Wrapping Up

The major part of Rubyists opts for ActionMailer. But it doesn’t mean that you should do either. Pick an option that fits best for your project needs. For some reason, even the simplest way provided by Pony gem can be the perfect one. Good luck!


Dipesh Batheja

Dipesh Batheja is Managing & Technical Director at Netling, a prestigious name in the web development industry. The company is known for providing the best front-end (PSD to HTML) and Wordpress development services to clients across the globe.

Apart from managing, architecting, Dipesh also has a passion for writing and he loves to create informative, quality and well-researched content for his audience. He has a deep interest in writing on the latest trends in web design and development.