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To use Gmail SMTP to send emails in Ruby, you can use the following steps:

1. Install the gem 'mail' by running the following command in your terminal:

   gem install mail
   

2. Create a new Ruby file and require the 'mail' gem:

   require 'mail'
   

3. Set up your Gmail account credentials:

   options = {
    :address              => "smtp.gmail.com",
    :port                 => 587,
    :user_name            => "your_username@gmail.com",
    :password             => "your_password",
    :authentication       => "plain",
    :enable_starttls_auto => true
   }
   

4. Use the 'mail' gem to create a new email:

   Mail.defaults do
    delivery_method :smtp, options
   end
   
   email = Mail.new do
    from    'your_username@gmail.com'
    to      'recipient@example.com'
    subject 'This is a test email'
    body    'Hello World!'
   end
   

5. Send the email using the 'deliver' method:

   email.deliver
   

And that's it! Your code should be able to send an email using Gmail SMTP.