Ruby

This example shows how to send email plain text and HTML email using Ruby. The gem Mail is required.

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require 'mail'
Mail.defaults do
  delivery_method :smtp, { :address   => "smtp.sendgrid.net",
                           :port      => 587,
                           :domain    => "yourdomain.com",
                           :user_name => "yourusername@domain.com",
                           :password  => "yourPassword",
                           :authentication => 'plain',
                           :enable_starttls_auto => true }
end

mail = Mail.deliver do
  to 'yourRecipient@domain.com'
  from 'Your Name <name@domain.com>'
  subject 'This is the subject of your email'
  text_part do
    body 'Hello world in text'
  end
  html_part do
    content_type 'text/html; charset=UTF-8'
    body '<b>Hello world in HTML</b>'
  end
end
To install the Mail gem please note that you need the OpenSSL library installed, then run the following: 
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gem install mail