Ruby on Rails

This Rails example shows how to send an email for user signups. You can also checkout this Ruby gem for more advanced features.

Info This example is specific to ActionMailer. You can use any SMTP library that is compatible with Rails, but the configuration may be slightly different.
In config/environment.rb specify ActionMailer defaults 
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ActionMailer::Base.smtp_settings = {
  :user_name => "sendgridusername",
  :password => "sendgridpassword",
  :domain => "yourdomain.com",
  :address => "smtp.sendgrid.net",
  :port => 587,
  :authentication => :plain,
  :enable_starttls_auto => true
}
Warning As a best practice, you should not store your credentials directly in the source but should instead store them in configuration files or environment variables. See this tutorial on environment variables in rails.
Create your notification model in app/models/notifier.rb 
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class Notifier < ActionMailer::Base
  default :from => "any_from_address@example.com"

  # send a signup email to the user, pass in the user object that contains the user's email address
  def signup_email(user)
    mail( :to => user.email,
    :subject => "Thanks for signing up" )
  end
end
In the controller in app/controllers/users_controller.rb add 
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class UsersController < ApplicationController
  def create
    # Create the user from params
    @user = User.new(params[:user])
    if @user.save
      # Deliver the signup_email
      Notifier.signup_email(@user).deliver
      redirect_to(@user, :notice => "User created")
    else
      render :action => "new"
    end
  end
end