Sendgrid / email sending issues in Ruby on Rails (hosted on Heroku)

I spent half a freakin' day on this and finally got mine working now. Quite frustrated as it was due to a poor documentation error. I'm running Rails 3.1 and Cedar stack on Heroku by the way.

So http://devcenter.heroku.com/articles/sendgrid will tell you to put your SMTP settings stuff in config/initializers/mail.rb. BUT... on http://docs.sendgrid.com/documentation/get-started/integrate/examples/rails-example-using-smtp/ it says to put all your SMTP settings stuff in config/environment.rb instead of config/initializers/mail.rb

So the solution is to put that in your environment.rb file. This is how my environment.rb looks:

# Load the rails application
require File.expand_path('../application', __FILE__)

# Initialize the rails application
Freelanceful::Application.initialize!

# Configuration for using SendGrid on Heroku
ActionMailer::Base.delivery_method = :smtp
ActionMailer::Base.smtp_settings = {
  :user_name => "yourSendGridusernameyougetfromheroku",
  :password => "yourSendGridpasswordyougetfromheroku",
  :domain => "staging.freelanceful.com",
  :address => "smtp.sendgrid.net",
  :port => 587,
  :authentication => :plain,
  :enable_starttls_auto => true
}

To get your SendGrid username and password, type

$ heroku config -long

Hope that helps.. and more people in the future of this headache.